Luke’s and Roosevelt Hospitals. Board certified by the American Board of Emergency Medicine, he holds a specialty in Infectious Disease, Emergency Medicine, and Travel Medicine. A graduate of Mount Sinai School of Medicine in New York, NY, Dr. Cahill completed his residency training in Emergency Medicine at Brown University/Rhode Island Hospital in Newport, RI. Dr. Cahill is frequently named to the list of top doctors, and most recently appeared in the Castle Connolly 2011 edition of “Top Doctors: New York Metro Area” and “America’s Top Doctors.”