I first met Mark Josephson in the early 1980s at his conference in Philadelphia, which I attended as a trainee. He was an inspiring figure, with his incisive commentary and enthusiasm for the field. It was there that I first heard Al Waldo explain entrainment, which he illustrated by drawing diagrams on a large flip chart. The discussion was spirited! Mark brought people together, then pushed them with intellectual rigour. He used this approach with everyone from medical students to senior investigators. He routinely challenged conventional thinking, pushing the field forward.
From a review of Mark’s publications one would appreciate only part of his impact on the field. He was a tireless and inspiring teacher in the clinic, on the wards, in the electrophysiology laboratory, and in countless conferences and scientific meetings. His passion for electrocardiography and electrophysiology inspired more than a generation of physicians and investigators who can be found in academic institutions and clinics around the world. He was a mentor and friend to those who trained under him, as well as to those who did not have that opportunity but sought his advice. He will be greatly missed.