Having taught theology for many years in seminaries in São Paulo, Brazil, various countries around the world, and DTS, Dr. Horrell serves as interim chair of Missiology focused on engagement and partnership with the body of Christ worldwide. Since studying at Francis Schaeffer's Swiss L'Abri, understanding the Holy Trinity been his passion and motivation for teaching, writing, pastoring, and global missions. He and his love Ruth have two daughters, two DTS son-in-laws, eight grandchildren, and little Lucy, the first of great grandchildren.