Following a successful career as a private practice dentist, Dr. Callan returned to his alma mater, DCG as an Assistant Professor in the Department of Oral Rehabilitation. He served as Chair of the Department of General Dentistry for 11 years. He has since received a Specialist degree in Educational Leadership and his Doctoral degree in Educational Innovation. Dr. Callan retired from the faculty of his alma mater in December 2019. Dr. Callan is a dental education consultant and continues to conduct research on the application of digital technologies in the education of health professionals. He is a member of the International College of Dentists, the American College of Dentists, the Pierre Fauchard Academy, OKU Dental Honor Society, Augusta University Academy of Educators and the Phi Kappa Phi Honor Society.