Harold James Charles “Jeremy” Swan (1 June 1922 – 7 February 2005) was an Irish cardiologist who co-invented the Swan-Ganz catheter with William Ganz at Cedars-Sinai Medical Center in 1970.

He then entered the Royal Air Force medical service from 1946 to 1948, being stationed in Iraq.

[8] Swan worked as a cardiologist in the Mayo Clinic (in Rochester, Minnesota), and later moved to Cedars Sinai Hospital (Los Angeles).

His description of the invention of the catheter is said to have derived from watching the wind playing with sails in Santa Monica.

Swan died on 7 February 2005 from complications following a heart attack after a long period of debilitation from a stroke that he suffered from in 2001.