Carbon Costume

On The Big Bang Theory, Barry Kripke (played by John Ross Bowie) is a co-worker of Sheldon and Leonard.  A former plasma physicist, he eventually changes focus to explore string theory and works with Sheldon at one point.  Kripke, as he is usually called by his colleagues, has rhotacism and is quite sarcastic.  Kripke often wears colorful flannels and button downs layered over a white t-shirt.  His red jacket makes a few appearances, though his outfits change often throughout the series.