He joined Eric Mangini's staff with the Cleveland Browns as a coaching assistant in 2009 and was made an offensive assistant coach for the 2009 and 2010 seasons. Shamash joined the Browns after serving in the game operations and special events department for the New York Jets in 2008, spending time as a defensive assistant for Columbia University. Dan has been noted for his strong work ethic, intelligence, and preparing rookie skill position players like Colt McCoy and Carlton Mitchell.

A graduate of Carnegie Mellon University, Shamash was a 3-year letter winner at inside linebacker, helping the Tartans to a 10-0 regular season record and the team's winningest season in the school's history in 2006. Dan attended Riverdale Country School in the Bronx, New York and was a letterman in football, track & field, and lacrosse for the Falcons.

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