Henrick Joan Joost (Hein) Wellens, M.D., (born 13 November 1935, The Hague) is a Dutch cardiologist who is considered one of the founding fathers of the cardiology subspecialty known as clinical cardiac electrophysiology.
Clinical cardiac electrophysiology enables patients with cardiac arrhythmmias to be subjected to catheter electrode mapping and stimulation studies.
Paul Puech, first in Mexico and later in France; Benjamin Scherlag and Onkar Narula in the USA; and Dirk Durrer and Philippe Coumel in Europe were the field's pioneers in the 1950s and 1960s.
The field's second wave of innovators used these techniques to unravel the mechanisms of tachycardia in humans and set the bases for their treatment.
Among them, Hein Wellens in Europe and Kenneth Rosen, John Gallagher, and Mark Josephson in the USA had the greatest impact as researchers and teachers.
Josephson is the author of the first and most successful textbook of clinical cardiac electrophysiology, now in its fourth edition.Wellens, known among European cardiologists as "the giant of Maastricht", has for many years been associated with the University of Limburg School of Medicine in Maastricht, Netherlands.
At his department of cardiology, many future clinical cardiac electrophysiologists trained from 1976 until his retirement in 2002.