Rubuta ci gaba don wannan sakin layi - Thiessen, a farkonsa a Kanada Juniors, ya rasa wasan karshe na 2001 Canadian Junior Curling Championships yana jagorantar Mike McEwen. Thiessen ya kasance memba na ƙungiyar zakarun Universiade ta hunturu ta 2003. Ya wakilci Jami'ar Brandon, yana jagorantar Mike McEwen. Bayan jami'a, ya taka leda ga Sean Grassie kafin ya koma yin wasa a Alberta a matsayin jagoran Mark Johnson a shekara ta 2004. A shekara ta 2006, ya koma buga wa Kevin Koe. Thiessen ya lashe Kofin Kanada na Curling na 2008 tare da ƙungiyar, kuma ya cancanci Brier na farko a 2010 a matsayin Team Alberta. Tawagar ta lashe Brier bayan ta doke Glenn Howard na Ontario 6-5 a wasan karshe. Sun ci gaba da cin nasara a gasar zakarun duniya ta wannan shekarar, inda suka sami lambar zinare bayan nasara a kan Norway, wanda Torger Nergård ya tsallake. Bayan Pat Simmons ya sanya hannu tare da ƙungiyar, sun tafi Brier na biyu a cikin 2012, amma sun yi rashin nasara ga Ontario, wanda Glenn Howard ya tsallake shi a wasan karshe. A 2014 Brier da rink maimaita a matsayin Canadian zakarun, kayar da John Morris 'B.C. rink 10-5 a wasan karshe. Tawagar za ta ci gaba da kammala a matsayi na 4 a Gasar Cin Kofin Duniya ta maza ta 2014
Ka yi haƙuri. Bayan kakar wasa, Koe ya bar kungiyar kuma John Morris ya maye gurbinsa. Teamungiyar za ta wakilci Team Canada a 2015 Tim Hortons Brier a matsayin mai karewa. Za su lashe Brier na 2015 kuma su ci gaba da lashe lambar tagulla a Gasar Cin Kofin Duniya ta Ford ta maza ta 2015. Teamungiyar za ta wakilci Team Canada a 2016 Tim Hortons Brier a karo na ƙarshe, ta gama a matsayi na 5. Ƙungiyar za ta bi hanyoyi daban-daban bayan kakar wasa.