He is married to actress Spencer Kayden, and they have a son together, Haskell.
Mark is known for many recurring guest appearances – including the movie Election starring actress Reese Witherspoon. Some of the shows he's had recurring roles are include: Boy Meets World (1999), Will & Grace (2004), Prison Break (2007) and The Big Bang Theory (2007-2008). Most recently he's had recurring roles on are Awake (2012) and Getting On (2013-2014).
He's had several guest appearances on many notable shows; including: Desperate Housewives (2005), Six Feet Under (2005), Grey's Anatomy (2006), NCIS (2006), Bones (2006), The Closer (2006), The Good Wife (2011), Castle (2011) and The Mentalist (2014).
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