He represented Brandon University, playing lead for Mike McEwen. After university, he played lead for Sean Grassie before moving to play in Alberta as Mark Johnson"s lead in 2004. In 2006 he moved to play for Kevin Koe.
After Pat Simmons signed on with the team, they went to their second Brier in 2012, but lost to Ontario, skipped by Glenn Howard in the final.
At the 2014 Brier the rink repeated as Canadian champions, defeating John Morris" British Columbia rink 10-5 in the final.
He currently plays lead for the 2014 Canadian champion rink, skipped by Pat Simmons, from Calgary, Alberta Thiessen won the 2008 Canada Cup of Curling with the team, and qualified for his first Brier in 2010 as Team Alberta. The team won the Brier after beating Ontario"s Glenn Howard 6-5 in the final. They went on to win at that year"s world championship, securing the gold medal after a win over Norway, skipped by Torger Nergåroad
Thiessen was a member of the 2003 Winter Universiade championship team
