Born in Louisiana, Haynes relocated to Europe in the late 1950s, settling for a time in Edinburgh where he helped transform the underground arts scene.
Along with local arts icon Richard Demarco, Haynes founded the Traverse Theatre, with the venue serving as a launchpad for a whole host of future famous names in British theatre and film.
In 1969, Haynes moved to Paris where he became well-known for his open house dinner parties and further established himself as a leading figure of the counterculture.
Maintaining links with Scotland and Edinburgh throughout his life, Haynes was awarded an honorary doctorate from Edinburgh Napier University in 2018.