Calum cut his golfing teeth at Aberdour and Muckhart, winning a couple of Perth & Kinross county events when he played mainly at the latter, but came through the amateur ranks in the shadow of players like Bradley Neil and Josh Jamieson.
He followed a fellow Aberdour member and former Scottish internationalist, Scott Crichton, to Western New Mexico University, using his spell in Silver City to not only improve his game but also make a big impression as a person.
Has three Challenge Tour titles to his name, the first one coming at the Galgorm Resort & Spa Northern Ireland Open, presented by Modest! Golf, a result which earned him full Challenge Tour playing privileges in 2019.
Won twice in the 2019 season, at the Euram Bank Open and the Made in Denmark Challenge, en route to finishing second in the Road to Mallorca and earning a Rookie season on the European Tour in 2020.