Pari gbolohun ti o tẹle: McMahon gba awọn ami ẹyẹ idẹ ni 2002 FESPIC Games ni 4 × 400 m relay, Javelin F37 Awọn ọkunrin ni 2006 IPC Athletics World Championships ati Awọn ọkunrin 4 × 100 m T35-38 ni
2011 IPC Athletics World Championships. Àwọn ojúewé wọ̀nyí jápọ̀ mọ́: Ni ọdun 2006, McMahon gba Ẹbun Aṣeyọri Awọn ere idaraya 2006. Ní Beijing 2008 Paralympics, ó parí ní ipò kẹrin nínú Javelin F37/38.