Leadership
Our leadership team has decades of combined experience ministering in cross-cultural environments. InterAct Ministries is governed by a board of directors and led by the executive director. Each of our fields are led by a field director who assembles a leadership team comprised of missionaries and support staff.
Lucas Orner
Executive Director & Siberia field director
Lucas and his wife, Jamie, began serving with InterAct in 2008 on the Siberia Field, where they spent 17 years in discipleship ministry. Lucas led the Siberia team as field director for the last 12 of those years. In 2025, the Russian government revoked his residency, and he and Jamie spent several months seeking the Lord before he stepped into the role of executive director of InterAct Ministries in June 2026. He and Jamie now live in Palmer, AK, with their four children (ages 10-19).
Mark Overbeek
Alaska Field Director
Mark and Heather have been living and serving as missionaries in Alaska since 2003. They lived in the village of Old Harbor, on Kodiak Island, for 11 years. Then in the city of Kodiak for 11 years. In 2025, Mark became the Alaska field director, and they moved with their family to Palmer, Alaska in 2026 to be at the Alaska field office and campus. Ministry both in remote Alaska among Native people and in a small church uniquely prepared Mark for his current role. They have a desire to serve, to encourage and to strengthen missionaries in their remote Alaska locations and to place missionaries in remote communities in Alaska that have little or no gospel presence.
Greg Hamilton
Canada Field Director
Greg and Laura have been serving as missionaries in western Canada since 2000. They served in southern Alberta and helped to develop Gladstone Mountain Gathering Grounds, an initiative to intentionally gather First Nations churches from western Canada. In 2010 the Hamiltons transferred to InterAct Ministries and Greg served as the assistant field director, becoming a part of the leadership team in Canada. In 2021 Greg became the Field Director for Canada. Greg’s upbringing as a MK and unique understanding of the context of missions’ outreach among indigenous people across Canada has prepared Greg well for his current role. As a couple they desire to continue to see indigenous communities impacted by the gospel across western Canada.