Pastor Ernie was born and raised on Kaua’i. He graduated from Azusa Pacific University where he earned a bachelor's degree in Biblical Studies. Over a ten year span, Ernie has ministered to the people of Kaua'i in various pastoral roles at Koloa Missionary Church, Lihue Missionary Church, and Grace Community Missionary Church. In 2021, Ernie married Aubrey Anne, the love of his life, and is excited to live life with her and to pastor the people of Koloa Missionary. He hopes to see the community transformed by the Gospel of Jesus Christ.

The administrative staff manages the church operations, communications, information technology, bookkeeping, property management, and general administration.

Wendy Casillas, Children's Director at Koloa Missionary Church, combines her love for teaching and faith to nurture the spiritual growth of the church’s youngest members. A full-time teacher at Kalaheo School and Kauai Girl, Wendy holds two Master’s one in Organizational Management and another in Elementary Education. Her leadership, passion, and dedication create a Christ-centered environment where children thrive. In her free time, she enjoys Kauai’s beauty, community connections, and family moments.

The board and elders of Koloa Missionary Church prayerfully provide spiritual guidance and church operations. The elders are Pastor Ernie Johnston, Dan Miyamoto, and Luke Nakatsukasa. Board Members include Pastor Ernie Johnston, Candace Tabuchi, Dan Miyamoto, Eric Regensberg, Kelliann Rita and, Rob Lansdell.

Colby Tracy completed bible school at KCF's Anchor House in 2023. Koloa Missionary Church welcomes Colby as our new Youth Director and we are excited to see God's plans through Colby's discipleship. "I'm stoked to be serving God as a youth leader here in koloa. I know God has been preparing me for work in youth ministry for the past few years. After Completing bible school in 2023 at Kauai Christian Fellowship's Ahncor house, I jumped right into ministry interning at Lihue Missionary Church and am now serving as the new Youth Director at Koloa Missionary Church. I Feel so blessed to be apart of this community and see how God is working in the youth." -Colby