Dr. Bailen is a native of Louisville. He received his undergraduate degree from Centre College in Danville, Kentucky, before attending the University of Louisville School of Medicine. After earning his degree in medicine in 1972, he received post-graduate training in internal medicine at the University of Miami and in general surgery at the University of Louisville. He received his specialty training in urology at the University of Louisville, and founded what was to become First Urology in 1979.

Prior to this Dr. Bailen served as a physician in the United States Navy at the Regional Medical Center at Great Lakes, Illinois. He has served as both president of the staff and chief of surgery at Clark Memorial Hospital. Dr. Bailen is the Principal Investigator for First Urology Clinical Research. In this capacity he oversees multiple clinical trials in prostate and bladder cancer, as well as the urological conditions. He also serves as the Co-Medical Director of the Advanced Therapy Clinic for prostate cancer. 

Dr. Bailen enjoys spending time with his wife, three children and five grandchildren, which he regards as the most influential people in his life.

Dr. Bailen is certified by the American Board of Urology, the ACRP as a Principal Investigator, and  is a Fellow of the American College of Surgeons. He is also a member of the following:

• American Urological Association
• Indiana State Medical Association
• Kentucky Medical Association
• Kentucky Urologic Association
• Louisville Urologic Society
• Indiana Urologic Association