A powerful second-rower, the highly-rated former Dollar Academy man impressed in his first season in the academy at Scotstoun, learning from senior players such as Rob Harley and Richie Gray.
Williamson was invited to train with the senior Scotland squad during the 2021 Guinness Six Nations, as one of Gregor Townsend's 'apprentice players' during the tournament.
The second-rower studies at the University of Strathclyde.