Whakaotihia te rerenga e whai ake nei: I te 2012 U.S. Olympic Trials i Omaha, Nebraska, te hui tohu a te U.S. mo te 2012 Olympics, i uru a Gemmell ki te roopu Orimipia o U.S. mo te wa tuatahi na te mea i mutu tuatahi i te 1,500 mita freestyle me te waa 14:52.19. I te 2012 Summer Olympics i Rānana, i noho ia ki te tuaiwa i roto i nga wera tuatahi o te
1,500-mita freestyle me te waa o te 14:59.05, a kaore i eke ki roto i nga tokowaru o runga ki te whakamutunga o te huihuinga.