In 1993, he accepted a full-time faculty position at Fresno Pacific University and continued to work at Link Care Center. Over the years, Dr. Collier has been an active Link Care staff member. He has worked extensively with the missionary and community clients in individual and couple therapy. He was a primary presenter in the L2L2 pre-field training program conducted for missionaries and has significant experience working with children and adolescents, many of whom were cross-cultural youth. His clinical expertise is in the area of affective disorders, personality disorders and anxiety disorders with adults, adolescents and children. Dr. Collier also conducts candidate and furlough assessments for a wide range of mission organizations.