The Vanderkoois are originally from DeKalb, Illinois, and have been in Soddo since 1994. Gary has a Ph.D. in Biochemistry and currently serves the hospital as Capital Account Coordinator, and Director of Construction and Planning. Mary is a physician whose specialty is Tropical Medicine, and she is the author of the Village Medical Manual, which is in its sixth edition. Gary and Mary have two children. The Vanderkoois serve through Equip International.