Dr. Leslie Howson French, 93, a retired cardiologist in the Washington area and a founder of Prince George's General Hospital, died of pneumonia Jan. 13 at the Washington Adventist Hospital.

Dr. French, a resident of University Park, was born in London. He came to this country in 1914 and studied in Chicago and then at the University of Pennsylvania to prepare for medical school. He earned his medical degree at George Washington University in 1924. He later took special courses at 25 universities and other institutions of learning.

In addition to maintaining a medical practice, Dr. French taught at the George Washington medical school, where he became head of the physiology department and chief of the electrocardiographic laboratory. For 25 years he also taught clinical physiology at the Georgetown University medical school.

In 1944, he was one of the founders of Prince George's General Hospital in Cheverly. In more recent years he had been director of medical education at Sibley Memorial Hospital in Washington.

Dr. French was the author of a teaching manual on physiology and electrocardiology as well as numerous papers for professional journals. He enjoyed photography and also made training films of surgical procedures for his medical lectures.

Dr. French married Margaret Scruggs, the medical librarian at George Washington University Hospital, shortly after his graduation from medical school. She died in November 1985. There are no immediate survivors.