From 1998 to 2012 he was a New Testament professor at the Trinity Evangelical Divinity School (TEDS) in Deerfield / Chicago, Akron / Ohio, Cincinnati / Ohio, Columbus / Ohio, Indianapolis / Indiana and Madison / Wisconsin and since 2012 Gordon -Conwell Theological Seminary in South Hamilton, Massachusetts (USA).
Von 1998 bis 2012 war er Professor für Neues Testament an der Trinity Evangelical Divinity School (TEDS) in Deerfeeld/Chicago, Akron/Ohio, Cincinnati/Ohio, Columbus/Ohio, Indianapolis/Indiana und Madison/Wisconsin; seit 2012 lehrt er am Gordon-Conwell Theological Seminary in South Hamilton/Massachusetts (USA).