Dillen was born and raised in a gold mining town in South Africa. He moved to the United States in April of 1996. Dillen and his business partner, Niel Visser, started Advanced Therapy Solutions in 2003. Dillen and Niel manage and own five therapy clinics; two adult clinics and three pediatric clinics in Spartanburg and Greenville. Dillen enjoys teaching and mentoring students and other therapists. He is very motivated in building therapeutic alliances with team members, parents, and teachers