New York-born actor Charlie Day appeared in an impressive array of Williamstown Theatre productions before transitioning into television with a brief appearance in the Mary Tyler Moore/Valerie Harper reunion special Mary and Rhoda. Subsequent roles on Madigan Men, Law & Order, and Third Watch helped Day build an impressive list of small-screen credits, and in 2005 he joined the cast of the deliciously warped FX sitcom It's Always Sunny in Philadelphia. Cast as an inherently good-natured guy often done in by his own shady intentions and poor luck with ladies, Day held his own opposite Danny DeVito, helping to establish himself as a respectable rising talent. ~ Jason Buchanan, Rovi