Rubuta ci gaba don wannan sakin layi - Severn ya fara wakiltar Amurka a Wasannin Paralympic na bazara na 2008 a Beijing, ya shiga harbi da kuma jefa faya-fayen. Shekaru hudu bayan haka ya sami nasarar Paralympic a Wasannin 2012 a London
, inda ya jefa tazarar 8.26 don samun lambar tagulla a harbi.