Reservist with Christian Peacemaker Teams since 1990, with experience in Vieques, PR; Colombia; Gaza Strip and West Bank, Palestine; Chiapas, Mexico; Iraq; and with First Nation communities in New Brunswick, South Dakota, and New York. Organic market gardener. Represented the Church of the Brethren on CPT's Steering Committee.

Mark grew up Mennonite in North Newton, KS where he graduated from Bethel College in 1993 with a BA in Physics. From 1993-1995 he worked in Boulder, CO, directing a start-up Victim Offender Reconciliation Program and working on international issues at the Rocky Mountain Peace Center. He joined CPT in 1997 as a full-time worker and served on CPT's Hebron project for two-and-a-half years and with CPT's Chiapas, Mexico project for nearly a year. Between 2000-2001 he completed a Masters degree in International Peace Studies at Notre Dame University