Last weekend he achieved outstanding results at the British National Masters Long Course Championships held in Manchester, where he won bronze in the 400m Individual Medley and 100m backstroke races and gained top ten places for his other two events.
It came a few weeks after he won the two mile event at the Crossmichael Wild Swim at Loch Ken in May.
And in April he also secured silver medals for both his 200m individual medley and 200m backstroke races at the Scottish National Open Masters Swimming Championships at Tollcross.
Leon joined Dumfries ASC in October 2014, but a broken arm resulted in a delayed return to full training until January.
Having swum at school and university he revived his swimming career again after starting work.
His partner Emily, a former Dumfries Dolphin, is also still a keen swimmer and won her half mile race at the Crossmichael Wild Swim last month.
Furthermore, their son, Rory, a Junior Dolphin, swims with the club and has just started competing this year as well.
A club spokesman said: “Leon is the first competitive Masters swimmer that Dumfries ASC has had for several years and we hope that many more will follow.
“The club has seen our Masters Squad double in size over the last few months with a variety of swimmers aged from 18-40+ seeking to improve their fitness, swimming skills and train to compete in open water, triathlon and other Masters swimming events.”
To find out more about Masters (18+) swimming opportunities e-mail dascmembership@hotmail. co.uk.