Donnelly made his debut in the Speed Skating World Cup at the beginning of the 2015/16 season in Calgary , where she finished 24th over 1500 m and 13th over 5000 m in the B World Cup. In the team sprint, he won his first World Cup. In January 2016 he won bronze over 1,500 m and silver over 5,000 m at the Canadian Championships in Calgary. At the individual distance world championships in Kolomna in 2016 , he won the bronze medal in the team pursuit. In March 2016, at the Junior World Championships in Changchun , he won the bronze medal in the mass start, the silver medal in the team pursuit and over 1500 m and the gold medal in the 1000 m, over 5000 m and all-around competitions.
Personal bests
500 m 35.87 sec. (installed on March 19, 2016 in Calgary)
1000 m 1: 09.81 min. (installed on January 5, 2016 in Calgary)
1500 m 1: 45.68 min. (installed on March 20, 2016 in Calgary)
3000 m 3: 45.45 min. (installed on September 25, 2015 in Calgary)
5000 m 6: 28.30 min. (installed on November 13, 2015 in Calgary)