David and Marilyn Graffenberger

David and Marilyn Graffenberger have been missionaries with One Mission Society since 1963, serving first in Haiti where they began a vocational Bible school (now university) in 1967. In 1979, they joined the homeland staff at OMS World Headquarters in Greenwood, Indiana.  David coordinated overseas operations as director and vice president of Field Ministries (now Global Ministries). Marilyn served in Global Ministries and then as assistant treasurer. 

From 1988 until 2004, David, assisted by Marilyn, worked as the international director of Every Community for Christ (ECC), the church multiplication catalyst of OMS. ECC assigned small teams of two to six men or women to a specific area or group of people in their own country.  The goal of each team was to lead people to Christ, establish them in their Christian faith, and organize them into local congregations. This strategy changed in 2003 to a church multiplication strategy. This greater emphasis on New Testament patterns of discipleship, leadership training, and church structures requires vision casting and the training of workers at every level in church multiplication principles and practices.

From 1993 to 1998, David and Marilyn also gave leadership to the OMS CoMission teams of missionaries in Russia, Estonia, and Eastern Europe. David was field leader in Russia from 1998 to 2000. Marilyn was the OMS Russia field treasurer from 1993 to 2001. 

From 2009 to 2021, the Graffenbergers spent extended periods in Haiti, assisting with field leadership. 

David serves as the assistant church multiplication facilitator for Haiti and mentors younger men. He also serves on the board of Bethesda Medical Center, chairs the board of the Cap Haitian Christian School, and is a member of the board of Mercy Incorporated, a humanitarian organization, partnering with One Mission Society.

From 2021 through 2024, Marilyn has served as the Haiti bookkeeper and assists David where needed.

The Graffenbergers make their home near Albany, Oregon. Their son Brian and his wife Susie farm in Oregon and are involved in agriculture development in northern Haiti, where Brian grew up. Brian and Susie have two married children living nearby. Levi works with his father, and Kirsti is a registered dietician. 

ed children living nearby. Levi works with his father, and Kirsti is a registered dietician.