Josephson was a graduate of
Trinity College in
Connecticut and subsequently went to medical school at
Columbia University College of Physicians and Surgeons. He completed his
residency training in Internal Medicine at
Mount Sinai Hospital in
New York City and his cardiology fellowship at the
Perelman School of Medicine at the University of Pennsylvania. After spending two years as a research associate with Anthony Damato at the
Staten Island Public Health Service Hospital, he published articles on the electrophysiologic basis and anatomic location of AV nodal reentry and map-guided subendocardial resection to cure
ventricular tachycardia, a procedure
Time dubbed "the Pennsylvania Peel" in honor of the Penn cardiology department's surgical innovation. Josephson worked closely over the years with European cardiac electrophysiology pioneer
Hein Wellens, chief of cardiology emeritus at the
University of Limburg in Maastricht,
Netherlands. For over 30 years, they coached together at high-yield "How to Approach Complex Arrhythmias" course for cardiologists and EP fellows. In the 2000s, they initiated an advanced course "Intracardiac Unknowns" which was attended by most electrophysiology trainees in the USA for over 10 years. == Awards ==