Thenhaus began his National Lacrosse League career with the Buffalo Bandits in the 2007 NLL season.
[1] On February 28, 2008, Thenhaus was traded to the Edmonton Rush in exchange for a second round pick in the 2008 National Lacrosse League entry draft.
After two seasons in Boston, Thenhaus was acquired by the Buffalo Bandits in the Blazers' dispersal draft.
He played one year in Buffalo before being signed to a contract by the Toronto Rock.
[3] In 2006, Thenhaus led the OLA Junior B Lacrosse League in scoring and won the Founders Cup National Title as a member of the Oakville Buzz.