Martin (MTh) is an ordained pastor of the Evangelische Landeskirche in Württemberg (Germany), where he served two parishes from 1982-1987. In 1988 he was seconded to WEC International. After Portuguese language study he served eleven years in Guinea-Bissau. He was involved in discipleship-ministry and theological training and helped to set up the first resident Bible Institute in Guinea-Bissau. In 2001 Martin and Ingeborg moved to the Netherlands to join the Cornerstone staff. Martin is Academic Dean and teaches OT exegesis, interpersonal relationships, and discipleship.