[4] After his sister's retirement from competitive figure skating in April 2015, he teamed up with Yura Min to represent Republic of Korea.

Representing the Republic of Korea, Alexander and Yura competed in the 2018 Pyeongchang Winter Olympics where they finished in 18th place.

[9] He is a Phi Theta Kappa Honor Society college student, majoring in linguistics and foreign languages.

[13][14] In 2003, the Gamelins started taking private ice dance lessons from the husband-and-wife coaching team of Alexander Esman and Marina Koulbitskaya.

[18] The following season, skating on the intermediate level, the Gamelins won the silver medal at the 2009 Eastern Sectionals and gold at the 2009 U.S.

[30] At home, they won the bronze medal in junior dance the 2011 U.S.Eastern Sectional Figure Skating Championships[31] and finished 7th at the 2011 U.S.

[32] Early in the 2011–12 season, the Gamelins finished 9th at the 2012 ISU Junior Grand Prix in Latvia,[33] 4th at the 2012 Eastern Sectionals[34] and in 12th at the 2012 U.S.

[35] Ahead of their first senior season, 2012–13, the Gamelins relocated to Silver Spring, Maryland to train at the Wheaton Skating Academy with Alexei Kiliakov and Elena Novak.

[37] Remaining with Kiliakov for their second season as seniors, the Gamelins won the bronze medal at the 2014 Eastern Sectionals[38] and finished 12th at the 2014 U.S.

They continued to train in Novi, Michigan under Shpilband, Fabian Bourzat, Greg Zuerlein, and Adrienne Lenda.

[42][43] They achieved both their ISU season's and personal best at the 2016 Four Continents Championships in Taipei, where they finished 8th of 16 teams, ending up as the top Korean dancers at the event.

On the domestic front, Min and Gamelin earned the gold medal in senior dance at both the 2017 KSU President Cup Ranking Competition and the 2017 South Korean Figure Skating Championships.