Mark G Hart (born July 2, 1953 in Fort Scott, Kansas), is an American musician and multi-instrumentalist best known for being a member of both Supertramp (1986–1988, 1996–2002, 2015) and Crowded House (1993–1996, 2007–present). As well as being a group member, touring and session musician, Hart has composed film scores and is a record producer.