He graduated from Mount Sinai School of Medicine and then he performed his residency at Maimonides Medical Center. His clinical interests include breast augmentation, tummy tuck (abdominoplasty), and liposuction. Dr. Callahan's average patient rating is 3.5 stars out of 5. He is in-network for Medicare insurance. He has received professional recognition including the following: Bergen County Super Doctors. Dr. Callahan is professionally affiliated with Hackensack University Medical Center.