Dr. Timothy Brosnan The principal dentist has more than 30 years of clinical experience and years of advanced training in all aspects of General and Cosmetic Dentistry. Dr. Brosnan combines exceptional education, extensive clinical experience, and long-standing personal dedication to improving dental health. He is a graduate of the University of Pennsylvania School of Dental Medicine. He founded his private practice in 1983 in Broomall, where he remains today. Since its founding, The Brosnan Dental Building has become a neighborhood fixture in the surrounding community. His current staff of dental assistants and patient coordinators have been with him for nearly 30 years — since the day he opened his doors. Dr. Brosnan has been married for 30 years with four grown daughters. His hobbies include, golf, model ship building, and classic cars.