 Kuwedzera pakuita kwake mitambo yeParalympic, Severn avewo ari mumwe wemapoka matatu eU.S. achikwikwidza paIPC Athletics World Championships, kutanga muChristchurch, New Zealand pa2011 IPC Athletics World Championships. Severn akahwina menduru mbiri dzeWorld title, ese ari maviri mukupfura uye ese ari maviri sirivheri, muLyon muna 2013 uye Doha muna 2015. 