H.J.C. "Jeremy" Swan (1 June 1922 – 7 February 2005) was an Irish cardiologist, originally from Sligo, who co-invented the Swan-Ganz catheter (widely used in intensive care units) with William Ganz at Cedars-Sinai Medical Center in 1970.Swan was educated at Castleknock College and worked as a cardiologist in the Mayo Clinic (in Rochester, Minnesota), and later moved to Cedars Sinai Hospital (Los Angeles).