Don Barry Mason was the founder of the Psychedelic Shamanistic Institute (PSI), which other member that's Welsh, that died on 10 April 2016?
Don Barry Mason Don 'Barry' Mason (1950–2006) was the founder of the Psychedelic Shamanistic Institute (PSI), a networking organisation that encouraged ethnobotany and scientific research into cannabis and other psychoactive plants while contributing substantially to the public debate about drug policy reform. Associates of PSI include: Mathew Atha, Colin Angus, Brian Barritt, Michael Carmichael, Fraser Clark, Paul Devereux, the late John Entwistle, Paul Flynn MP, Ben Ganly, Lee Harris, Mike Jay, Howard Marks, Dr John Marks, Jonathan Ott, Dr Russell Newcombe, Richard Rudgley and Youth.
Mervyn Davies Thomas Mervyn Davies OBE (9 December 1946 – 15 March 2012), often known as "Merv the Swerve", was a Welsh rugby union player who won 38 caps for Wales as a No. 8.