Rubuta ci gaba don wannan sakin layi - A 2012 U.S. Olympic Trials a Omaha, Nebraska, gasar wasannin motsa jiki na Amurka don gasar Olympics ta 2012, Gemmell ya shiga tawagar Olympics ta Amurka a karo na farko ta hanyar kammala na farko a cikin mita 1,500 tare da lokaci na 14:52.19. A Wasannin Olympics na shekara ta 2012 da aka yi a Landan, ya zama na tara a tseren mita 1,500
tare da lokacin 14:59.05, kuma bai ci gaba a cikin manyan takwas zuwa wasan karshe ba.