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Kal Penn is an actor who starred as Kumar in the Harold & Kumar film series opposite John Cho.
He makes a brief cameo with Bert in Mashable's online video "A Lovely Sunny Day".
Penn has taught at the University of Pennsylvania in the Cinema Studies Program as a visiting lecturer, and served in The White House under President Barack Obama as Associate Director of Public Engagement. His other acting credits include playing Dr. Lawrence Kutner on House (with Hugh Laurie), appearances on How I Met Your Mother and Buffy the Vampire Slayer, and the film Superman Returns.