Our Mission

After graduating with a degree in Business from San Diego Christian College, Brooks worked for an international company until he and his wife, Nina, chose to leave the cooperate world to plant a church in an unreached people group in the lowlands of Papua New Guinea. After 14 years, due to God’s good grace, the Yembi Yembi tribe had a healthy, Gospel-centered church and Brooks, Nina, and their son, Beau, transitioned back to the states. Brooks has served as the President of Radius International since 2016.

Joe has been Radius on-site staff for 10 years. He earned his BS from Liberty University and holds several positions within Radius, including Vice President of Operations and classroom instructor. His fun and adventurous family is made up of three grown children and a fourth who still lives at home.

Brad spent over 20 years planting a church among the Iteri people in Papua New Guinea. After the Iteri church could function on its own, he returned to San Diego, where he served as the Missions Pastor at Clairemont Emmanuel. In that role, he observed a disturbing increase in missionary attrition and, along with other like-minded pastors and members of the missions community, identified the need for quality cross-cultural training for missionary candidates. After years of research and prayer, Radius was born. Brad is its primary church planting instructor. He travels extensively around the U.S. speaking at conferences and churches. Brad has four married children and enjoys spending as much time as possible with them and his ten grandchildren.

Sent by Clifton Baptist Church in Louisville, Kentucky, Joseph has been on staff since 2012. Before joining Radius, he received a B.A. from Taylor University in Biblical Studies and Christian Education and a Master of Divinity degree from The Southern Baptist Theological Seminary, then served as an Associate Pastor at RiverLakes Community Church in Bakersfield, CA. He is now the Director of the Castillo Campus and an Instructor of Spiritual Disciplines. Joseph leads a Community Group and, along with his four children, feels incredibly blessed to share in the day-to-day life of the students.

Originally from Los Angeles, Peter holds a Master of Divinity from Capital Bible Seminary and has served in a wide variety of ministry platforms. He has been involved in pastoral ministry as a children’s pastor, youth pastor, college pastor, associate pastor, and senior pastor in churches in CA, MD, KS, and NM, with an emphasis on training men to teach and lead in a variety of contexts. He serves as on-site staff overseeing a community group and the ESL program. As a parent of three children, Peter has a heart for discipling families with young children.

Before joining the staff in 2012, Carl and his wife Myra lived in Iowa where they owned and operated a business for 16 years. They applied all that they learned during that season toward their various responsibilities at Radius. Carl is the Business Administrator (overseeing the financial, business, marketing, and technology) as well as managing the myriad of construction projects that have taken place on the campuses over the past 10 years. Carl is very involved in his local church Paseo Del Rey, in Chula Vista, CA. He and his wife have two married children who live locally and four darling grandsons they dote on.

After several years in the workforce, Brandon and his wife completed a two-year missionary training program with Ethnos360 (formerly New Tribes Mission). In 2006, along with their daughter (3) and son (1), they moved to Papua New Guinea with the goal of planting a church among one of the country’s many unreached language groups. In 2008, they began living among the islanders of Biem, off PNG’s north coast. After years of language and culture study, they were able to present the Gospel in the Biem language in 2012, and the Biem Church was born. Over the next 13 years, they discipled believers, translated Scripture, and helped develop local church leadership. They also served as consultants for broader church-planting efforts among other language groups in Papua New Guinea. After 19 years in PNG, Brandon and his wife have returned to the States, where they now serve with Radius International.

Sent by Clifton Baptist Church in Louisville, Kentucky, Jessica have been on staff with her husband Joseph since 2012. Along with teaching a class on culture and language acquisition, she also co-leads a Community Group with her husband. Jessica has 4 kids and feels incredibly blessed to share in the day-to-day life of the students.

Before joining Radius Trent lived in Texas where he worked as an operations manager in the Oil and Gas Industry. As a graduate of the Radius program and sent by Indian Creek Baptist Church, he shares a burden to see churches planted amongst unreached language groups. Utilizing his understanding as alumni, business knowledge from the workplace, ministry experience serving in the church, and life experience as a husband and a parent, he labors to train and equip students to be faithful cross-cultural church planters.

Nina Buser served as a missionary for 13 years among the Yembi Yembi people in Papua New Guinea with her husband Brooks. During that time, she was involved in developing an alphabet in the Yembi Yembi language, completing a translation of the New Testament, and helping establish a church with indigenous elders and deacons. She returned to the U.S. in 2016 to work with Radius International, where she teaches courses on language acquisition, Bible translation, parenting, and cross-cultural church planting.

Andy Naselli serves as Professor of Systematic Theology and New Testament. He teaches courses primarily at the seminary-level on Greek exegesis, New Testament, biblical theology, systematic theology, and ethics.

Dr. Ian Hamilton is president of The Paton Society, which seeks to present Reformed churches with the challenge of reaching the 3200 unreached language groups with the gospel. He also teaches historical theology at Westminster Seminary UK and serves on the board at Greenville Presbyterian Theological Seminary. He is author of many books, including Words from the Cross, Our Heavenly Shepherd, and a commentary on Ephesians in The Lectio Continua Expository Commentary on the New Testament.

Jeremy is the Director and Lead Instructor of the Chicago Course on Preaching. He is also the Resident Pastor for Ministry Apprenticeships at Christ Church Chicago. Before moving to Chicago to work full-time for the Charles Simeon Trust, he served as the lead pastor of Hope Community Church in Nashville, TN. While there, he served as the Director of Spanish-Language Initiatives for the Charles Simeon Trust. Before that, he and his wife were church-planting missionaries in Nicaragua.

After graduating from Southern Seminary in 2002, Dr. Bowman served as a rural church planter in Zambia with the International Mission Board. His passion is to see healthy churches led by theologically sound leaders reach those who have never heard the Gospel. After eight years in Zambia, the Lord led his family to South Asia to focus on church strengthening, leadership development, and unengaged people groups. His desire is to raise up students with a passion for Jesus and a passion for the nations.

Mark Dever is the senior pastor of Capitol Hill Baptist Church in Washington, D.C., and the founding president of 9Marks, a ministry dedicated to helping churches grow in biblical health. Widely respected for his clarity, theological depth, and pastoral wisdom, Dever has spent decades teaching on the nature, purpose, and practice of the local church.

Dever holds degrees from Duke University, Gordon-Conwell Theological Seminary, and a PhD from the University of Cambridge. He is the author of numerous influential books, including Nine Marks of a Healthy Church, The Deliberate Church, and Discipling, which have shaped pastors and church leaders around the world.

At Radius International, Mark Dever teaches on ecclesiology—the doctrine of the Church. His teaching at Radius presses students to think carefully about how healthy churches are planted, ordered, and sustained in cross-cultural contexts.

Dr. L. Michael Morales is professor of biblical studies at Greenville Presbyterian Theological Seminary, an adjunct professor at Reformed Theological Seminary, and a teaching elder in the Presbyterian Church in America. He is author of Who Shall Ascend the Mountain of the Lord?

Amy Bowman is a veteran missionary, author, and mentor with 17 years of cross-cultural service alongside her husband and four children in rural Zambia and South Asia with the International Mission Board. She is co-author of Before You Go, a devotional written by women, for women preparing for cross-cultural ministry, offering biblical encouragement and hard-won wisdom for life and service overseas.

Now based in Cedarville, Ohio, Amy works remotely with Radius International, mentoring and training the next generation of missionaries called to the unreached.

Abi Byrd serves with The Simeon Trust, a ministry committed to training men and women to handle God’s Word with clarity, conviction, and faithfulness. She is a gifted Bible teacher and trainer, known for helping others learn how to read, understand, and teach Scripture with care for both the text and the people receiving it.

Through her work with Simeon Trust, Abi helps lead and teach workshops that equip women to study the Bible inductively and teach it expositionally. Her instruction emphasizes careful observation, sound interpretation, and clear communication, all rooted in a deep confidence in the sufficiency and authority of Scripture.

As a missionary, translator and educator, Brunn spent over twenty years in Papua New Guinea where he served the Lamogai people through church planting, literacy training and Bible translation and consultation. Among his works is a complete translation of the New Testament into the Lamogai language.

George and his wife Harriett spent 18 years overseas in cross-cultural church planting. Their ministry began in January 1978, and that year the Lord sent them to Papua New Guinea. They had the privilege to pioneer a work among the Bisorio people, an solated tribe with little contact with the “outside” world. By God’s grace, there are now five churches and 8 Bisorio pastors. The entire New Testament and a large portion of the Old Testament Scriptures have been translated into the Bisorio language. The Walkers also served as consultants to other missionaries for culture and language acquisition. They continue to have a ministry with the Bisorio believers through periodic visits and continued work on Bible commentaries. In 2019, the Walkers joined InterAct Ministries, with George coming on board as a cross-cultural trainer and consultant.

Phil served 25 years as a church planter with the Mwinika People.

Robert served 25 years with the International Missions Board.

After graduating with a degree in Business from San Diego Christian College, Brooks worked for an international company until he and his wife, Nina, chose to leave the cooperate world to plant a church in an unreached people group in the lowlands of Papua New Guinea. After 14 years, due to God’s good grace, the Yembi Yembi tribe had a healthy, Gospel-centered church and Brooks, Nina, and their son, Beau, transitioned back to the states. Brooks has served as the President of Radius International since 2016.

Before joining the staff in 2012, Carl and his wife Myra lived in Iowa where they owned and operated a business for 16 years. They applied all that they learned during that season toward their various responsibilities at Radius. Carl is the Business Administrator (overseeing the financial, business, marketing, and technology) as well as managing the myriad of construction projects that have taken place on the campuses over the past 10 years. Carl is very involved in his local church Paseo Del Rey, in Chula Vista, CA. He and his wife have two married children who live locally and four darling grandsons they dote on.

Joe has been Radius on-site staff for 10 years. He earned his BS from Liberty University and holds several positions within Radius, including Vice President of Operations and classroom instructor. His fun and adventurous family is made up of three grown children and a fourth who still lives at home.

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Zac is a business professional in San Diego, CA. He and his wife, Shelbi, have been active and faithful members at Clairemont Emmanuel Baptist Church in San Diego since 1997. During that time, Zac has served in a variety of ways, including being an elder and long-standing member on the missions committee. Passionate about sending, the Shiras been an encouragement to Radius in many ways since its inaugural year. Zac and Shelbi are the proud parents of a daughter and two sons.

Brad spent over 20 years planting a church among the Iteri people in Papua New Guinea. After the Iteri church could function on its own, he returned to San Diego, where he served as the Missions Pastor at Clairemont Emmanuel. In that role, he observed a disturbing increase in missionary attrition and, along with other like-minded pastors and members of the missions community, identified the need for quality cross-cultural training for missionary candidates. After years of research and prayer, Radius was born. Brad is its primary church planting instructor. He travels extensively around the U.S. speaking at conferences and churches. Brad has four married children and enjoys spending as much time as possible with them and his ten grandchildren.

After several years in the workforce, Brandon and his wife completed a two-year missionary training program with Ethnos360 (formerly New Tribes Mission). In 2006, along with their daughter (3) and son (1), they moved to Papua New Guinea with the goal of planting a church among one of the country’s many unreached language groups. In 2008, they began living among the islanders of Biem, off PNG’s north coast. After years of language and culture study, they were able to present the Gospel in the Biem language in 2012, and the Biem Church was born. Over the next 13 years, they discipled believers, translated Scripture, and helped develop local church leadership. They also served as consultants for broader church-planting efforts among other language groups in Papua New Guinea. After 19 years in PNG, Brandon and his wife have returned to the States, where they now serve with Radius International.

Before Neil began working with Radius in 2024, he served in various leadership roles at his church and Banner of Truth. During that time, Neil also gained over 15 years of professional experience in management and recruitment at companies such as Apple and executive search firms. He earned his bachelor's degree in leadership and MBA in Organizational Science from Azusa Pacific University. Neil and his wife are foodies and love cooking for others at their home. They also enjoy reading and recommending books for all occasions. They have two young children that they are excited to raise alongside other families on campus in Mexico. Neil is passionate about connecting the right missionaries and partnerships for the glory of God.

Eddie Passmore began full-time ministry in 1980, which led to roles as a youth pastor, program director at a Christian camp, associate pastor of missions and outreach, and senior interim pastor. In May of 2003, he began his next chapter as a co-director at Mexico Caravan Ministries. Eddie is now the Director of Mobilization at Radius Serve.

Spencer earned a B.A. in Bible and Intercultural Studies from Grace University in Nebraska and later completed a master’s degree in Pastoral Counseling from Crown University. After graduating, he moved to Iowa, where he served as the youth and missions pastor at the church he grew up in.

In 2020, he moved to Tijuana, Mexico, where he began serving in full-time cross-cultural ministry. He serves as the Director of Radius Serve (formerly Mexico Caravan Ministries) and is committed to mobilizing and educating the Church for God’s global mission.

He has two small children with his wife Cassidy. As a family, they enjoy beach days and all the wonderful Mexican food in TJ.

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Wayne, originally from Taiwan and with a Master of Divinity degree from Gordon-Conwell Theological Seminary, has served at Radius Asia since its inception in 2018. Wayne was a pastor in Northern California for 5 years before his wife and their two daughters moved to the island of Biem in Papua New Guinea to plant a church. After the Lord brought that church to fruition, and desiring to help others prepare well to minister in an increasing difficult to reach world, they agreed to join the Radius team. Wayne is the Director of Radius Asia which includes not only the responsibility of training students but also the development of a staff team able to teach the myriad of components of the program.

Abigail is originally from Michigan. Sent by her home church Covenant Life Community Church, she moved to Radius as a Gap Year intern in 2022. The following year, she joined the staff as a Gap Year Lead and has had the privilege of leading the female interns during their time of service at the school. Abigail will attend online school in the fall of 2024 for accounting as she pursues a future in the mission field.

As the Administrative Assistant to the President, Adrianna works closely alongside Brooks and Nina Buser to assist them in the ministry the Lord has given them. Throughout her college years and through the faithfulness of her brother, Adrianna learned the call from Scripture to be faithful in bringing the gospel to unreached language groups. It was when her brother and his wife trained through Radius that she and her family learned the heartbeat of Radius and came to value this ministry. She and her husband, Manny, enjoy serving as members of their local church in San Diego, California. Though he doesn’t have an official role, he plays a humble and behind-the-scenes part in helping Adrianna fulfill her responsibilities at Radius.

Beth spent over 20 years planting a church among the Iteri people in Papua New Guinea. After the Iteri church could function on its own, she returned to San Diego, where she became involved in missions work connected to Clairemont Emmanuel. During that season, she helped identify the need for quality cross-cultural training for missionary candidates, which eventually led to the founding of Radius.

She has four married children and enjoys spending as much time as possible with them and her ten grandchildren.

Cassidy earned a B.A. in Bible and Intercultural Studies from Grace University in Nebraska. In 2020, she moved to Tijuana, Mexico, where she began serving in full-time cross-cultural ministry. She assists with the intern program and group coordination and is committed to mobilizing and educating the Church for God’s global mission.

She has two small children with her husband Spencer, both born in Tijuana. As a family, they enjoy beach days and all the wonderful Mexican food in TJ.

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Jada had the privilege of growing up in beautiful southeastern Pennsylvania. She received an associate degree in Business Administration from Thomas Edison State University. After years of desiring to support missions, she counts it an honor to do so through serving as Operations Coordinator at Radius International.

Sent by Clifton Baptist Church in Louisville, Kentucky, Jessica have been on staff with her husband Joseph since 2012. Along with teaching a class on culture and language acquisition, she also co-leads a Community Group with her husband. Jessica has 4 kids and feels incredibly blessed to share in the day-to-day life of the students.

Sent by Clifton Baptist Church in Louisville, Kentucky, Joseph has been on staff since 2012. Before joining Radius, he received a B.A. from Taylor University in Biblical Studies and Christian Education and a Master of Divinity degree from The Southern Baptist Theological Seminary, then served as an Associate Pastor at RiverLakes Community Church in Bakersfield, CA. He is now the Director of the Castillo Campus and an Instructor of Spiritual Disciplines. Joseph leads a Community Group and, along with his four children, feels incredibly blessed to share in the day-to-day life of the students.

Kellie lived in Texas where she was a healthcare manager and then a stay-at-home mom. As a graduate of the Radius program and sent by Indian Creek Baptist Church, she shares a burden to see churches planted amongst unreached language groups. Utilizing her understanding as alumni, knowledge from the workplace, ministry experience serving in the church, and life experience as a wife and a parent, she labors to train and equip students to be faithful cross-cultural church planters.

A longtime San Diego resident, Lisa worked as a nurse before she married John and until she chose to stay home to be a full-time homemaker. She enjoyed those full years as a busy mom to four children and an active volunteer at their home church. In 2016, Lisa rejoined the workforce as a 911 police dispatcher and, in 2019, joined the Radius staff working as Accounts Payable and as a member of the finance team.

Madeline is sent by Christ Proclamation Church in Connecticut, where she was born and raised. She received her Bachelor of Fine Arts degree in Painting and Graphic Design from the University of Hartford. After graduation, she worked in Bible restoration in South Carolina and then served as a Radius Gap Year Intern in 2023 and again in 2025. She is excited to spend the next few years as staff and continue supporting Radius’ goal of training students to plant churches among unreached language groups.

Before joining the staff in 2012, Myra lived in Iowa where she owned and operated a business for 16 years with her husband Carl. She applied all that she learned during that season toward her responsibilities at Radius. Myra serves as Office Administrator, supervising the bookkeeping and donation processing. She is very involved in her local church, Paseo Del Rey in Chula Vista, CA. She has two married children who live locally and four darling grandsons she dotes on.

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Originally from Los Angeles, Peter holds a Master of Divinity from Capital Bible Seminary and has served in a wide variety of ministry platforms. He has been involved in pastoral ministry as a children’s pastor, youth pastor, college pastor, associate pastor, and senior pastor in churches in CA, MD, KS, and NM, with an emphasis on training men to teach and lead in a variety of contexts. He serves as on-site staff overseeing a community group and the ESL program. As a parent of three children, Peter has a heart for discipling families with young children.

Rachel has been Radius on-site staff for 10 years. She has parlayed her experience as a preschool teacher, homeschooling mom, and trained delivery and postpartum doula into her roles overseeing the Gap Year interns, developing the childcare program, and helping expectant students navigate having a child in Mexico. Her fun and adventurous family is made up of three grown children and a fourth who still lives at home.

Rebecca counts it a huge privilege to be part of training students to take the gospel to unreached language groups. Originally from the UK, with a background in Library and Information Management, she serves as Classroom Coordinator and also provides administrative support for the Culture and Language Acquisition program. She lives on campus and enjoys being involved in the everyday life of the students.

Originally from Los Angeles, Sandy holds a Master of Education from UCLA and has served in a wide variety of ministry platforms. She has been actively involved with children’s and women’s ministries and has also worked for several independent learning charter schools. She serves as on-site staff overseeing a community group and the ESL program. As a parent of three children, Sandy has a heart for discipling families with young children.

As the student registrar, Shelly works with the applicants as they navigate through the admission process. Highlights of her job include phone conversations with prospective students and churches as they seek to learn more about Radius’ training program and communicating with admitted students as they are making arrangements to live in Mexico. Shelly and her husband, Jim, raised their 3 children in San Diego while attending Clairemont Emmanuel Church where they have served in a variety of ways throughout the years and grew in their knowledge of the importance of Jesus’ last command.

Before joining Radius Trent lived in Texas where he worked as an operations manager in the Oil and Gas Industry. As a graduate of the Radius program and sent by Indian Creek Baptist Church, he shares a burden to see churches planted amongst unreached language groups. Utilizing his understanding as alumni, business knowledge from the workplace, ministry experience serving in the church, and life experience as a husband and a parent, he labors to train and equip students to be faithful cross-cultural church planters.

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Brendan is originally from Vancouver, Canada and has lived in El Cajon, CA for the last 20 years. In 2000, he graduated from Southern California Bible College and Seminary with a Bachelor of Arts degree in Biblical Studies. Currently he works in Asset Management for Hamann Companies. Brendan’s zeal for International Missions is evident in the variety of ways he actively contributes his time, resources, and enthusiasm. He is married and has 4 children.

Zac is business professional in San Diego, CA. He and his wife, Shelbi, have been active and faithful members at Clairemont Emmanuel Baptist Church in San Diego since 1997. During that time, Zac has served in a variety of ways, including being an elder and long-standing member on the missions committee. Passionate about sending, the Shiras been an encouragement to Radius in many ways since its inaugural year. Zac and Shelbi are the proud parents of a daughter and two sons.

After graduating with a degree in Business from San Diego Christian College, Brooks worked for an international company until he and his wife, Nina, chose to leave the cooperate world to plant a church in an unreached people group in the lowlands of Papua New Guinea. After 14 years, due to God’s good grace, the Yembi Yembi tribe had a healthy, Gospel-centered church and Brooks, Nina, and their son, Beau, transitioned back to the states. Brooks has served as the President of Radius International since 2016.

As one of the founding board members, Joel has over 25 years of pastoral experience. He has also worked for a Christian foundation and has coordinated and instructed multiple Perspectives classes. Currently, he gives oversight and direction to missions in his local church, which focuses exclusively on unreached language groups. HIs day job involves project management across California for an earthmoving company. He has been married for over 30 years and has 10 children and one grandson.

Barry is an Agricultural consultant. Barry has a Master’s in Business Administration and Intercultural Studies and has held positions in sales, marketing and management for a variety of global businesses. He and his spouse have been married since 1986 and have three children.

Chad Vegas is the founding pastor of Sovereign Grace Church in Bakersfield, CA, where he has served since 2006. Chad received his M.A. from Talbot School of Theology. He also spent nearly two decades in public school education as both a teacher and board member. He has been married to Teresa since 1994 and they have 2 children.

Nathan grew up in Papua New Guinea as a missionary kid. Nathan studied Music at Point Loma Nazarene University where he met his wife, Kendra. Since 2000, he has been the Worship Leader at Clairemont Emmanuel Church where he now serves as both the Missions Pastor and Music Pastor. Nathan also enjoys leading worship at the Radius Conferences. Nathan and Kendra have raised three children and all of them are following in their talented musical parents’ footsteps.

Saved in a Perspectives class in 2010, Jeff immediately began to grow in his understanding of God and His plan of redeeming all nations to Himself. Jeff is a Heavy Civil Contractor in Bakersfield, California and works in the family business that was established in 1952. He and his wife, Lori, attend Sovereign Grace Church where Jeff participates in missions leadership and together they lead a community group. Jeff and Lori enjoy spending time with their children and growing family.

An avid supporter of Radius since its inception, Jonathan, a professor at Baylor University in Waco Texas, is passionate about exposing others to God’s heart of reaching all the ethne of the world. Since 2007, Jonathan has served in various ministries — deacon, missions board, elder, missions and sports ministries, and music ministries. Married 19 years, Jonathan and Julie have three children: Miles, Luke, and Vivian. They credit their family’s zeal for the completion of the Great Commission to their local church body and its history and strategic plan for sending out workers as well as taking the Perspectives course.