Krabi Boats 8

The OMF South Thailand Region is consists of four teams of OMF missionaries working together alongside local Christians, churches and other mission groups to realise our vision in planting movements of communities of faith in Jesus Christ.

Dave & Lila with Caleb, Caden & Corban

After working seven years as a civil engineer, Dave attended and graduated from Trinity Evangelical Divinity School in December 2009 with a Master of Divinity and briefly joined the pastoral staff of New Covenant Fellowship Church, their home church in Maryland. With a Master in Education Curriculum and Instruction, Lila was a teacher in the public elementary school system for eight years. It was through a combination of examining their life history, reading God’s Word, praying, the Spirit’s prompting, attending Perspectives on World Missions course together, and seeking the counsel of others in church that confirmed their calling towards the mission field.


Dave and Lila Chang are currently serving as full-time missionaries with OMF having completed their first term of 4 years church-planting in South Thailand. They were involved with language and culture studies, relational evangelism, English teaching outreach, as part of a church planting team. Recently they started a new team reaching out to university students at one of the universities in Nakhon Si Thammarat province.

They have 3 boys – Caleb, Caden, and Corban – the youngest of whom was born in Nakhon Si Thammarat.

Dave & Lila became the OMF South Thailand Regional Leaders in 2022.


 Jeff & Belinda Callow with Steven & Rowan


Jeff & Belinda joined OMF Thailand in the year 2000, bringing little Nathan (then aged 18 months) with them. After a year in Lopburi doing language study, they moved to Yala in the Deep South to work alongside the Yala ACTS Church and senior missionaries, Liberty Belandres and Cathy Pickard. While in Yala, their second son, Matthew, was born. Rowan came along while they were back in Australia on Home Assignment in 2004. At the start of their second term in 2005, Jeff, Belinda and family moved to Pak Phanang in Nakhon Si Thammarat province and started sharing the gospel there - back then there was no churches at all in the Pak Phanang district. Eventually a church formed, and the new beleivers worked alongside Jeff & Belinda in reaching their relatives and neighbours.

Jeff & Belinda became Regional Leaders of OMF South Thailand region in 2008. They phased out of the church planting work in Pak Phanang in 2013, leaving the church in the hands of local Christian leaders. They moved to a new area called Bang Jak. Since then their role as the Regional Leaders for OMF South Thailand has taken up more and more of their time. Steven joined them in 2015 - then a three year old Thai boy that they adopted in 2017.

Along the way, Belinda has become more and more involved in prayer counselling ministry. Jeff started running adventure camps in 2012 as a way to help Thai kids grow in confidence. Belinda enjoys good coffee, baking and good company - though not necessarily in that orrder. Jeff enjoys cycling, reading sci-fi novels and outdoor adventure activities.

In 2022, Jeff & Belinda handed over the regional leadership role to Dave & Lila Chang. They will continue church planting and training Thai Christians in the South. 


Steve & Pikulkaewkarn "Angel" McCallum

Angel and Steve 1

Steve is from the city of Vancouver in the beautiful wet west coast of Canada, though he has lived a variety of places across Canada, from Aboriginal communities to Toronto, Canada's big city. He has been interested in missions since coming to faith at the age of 17 but wasn't sure where or how to serve. 12 years later, after Bible school, doing his B.Sc in Biology and working in gardening landscaping for a few years, he sensed a call to Thailand in March of 2011. After exploring this call with a series of short-terms over the next three years, he has been serving full-time in Thailand since November, 2015. After full-time language study, he has been in South Thailand since August 2016, serving with Dave and Lila Chang in a new church planting location, in the district of Phrom Khiri in the province of Nakhon Si Thammarat.

Angel grew up in Pattani in South Thailand’s border region. She came to faith in Jesus when she was 12 through her Christian mother. She was part of the youth group at her church, Pattani Grace Church, and eventually was part of the ACTS youth committee, organising youth camps, activities and visitations for the ACTS youth throughout South Thailand.

Angel finished grade 12 at Dechapattanayanukul School, Pattani, then continued her studies at Silapakorn University at Nakhon Pathom, graduating with a Bachelor of Technology with a major in Engineering Business. While at university, she was an active member of the Cru ministry on campus. Having finished her degree, she decided to serve the Lord full-time before commencing work in the secular workforce. She has been working alongside missionary church-planting teams as an evangelist since August 2016. She is greatly appreciated by all the missionaries and local believers she comes in contact with.

Romance bloomed between Angel and Steve towards the end of 2016. They were married on 18 August 2018. Now they will work together reaching out to the people of Phrom Khiri district and starting a church there.