Dr. Hartel began teaching philosophy at Notre Dame International High School in Rome, Italy in 1984. In 1985 he moved back to the United States and began teaching philosophy at Xavier University in New Orleans, Louisiana. From 1986 to May of 1991, he taught philosophy at Loyola University of New Orleans. Finally, in August of 1991, he moved to Dubuque, Iowa and began teaching philosophy at Divine Word College in Epworth, Iowa. Dr. Hartel retired from teaching in 2019. He continues teaching Hatha Yoga at the Dubuque Community YMCA and at Body and Soul Wellness Center, Dubuque, Iowa. He also provides Therapeutic Services at Body & Soul through his practice of Philosophical Counseling and Logic-Based Therapy.