Kammala jumla mai zuwa: Severn ya fara wakiltar Amurka a Wasannin Paralympic na 2008 a Beijing, ya shiga harbi da kuma jefa faya-fayen. Shekaru hudu bayan haka ya sami nasarar Paralympic a gasar
Wasannin 2012 a Landan, inda ya jefa tazarar 8.26 don samun lambar tagulla a harbi.