Underhill, David
From The Big Bang Theory Wiki
Something of a celebrity in the world of physics. Dave won the McArthur Genius Grant for his work, some of which negated a lot of Leonard's work over the past years. Besides being a gifted scientist, Dave skis, plays in a rock band and collects vintage motorcycles ... and is much more successful with Penny than Leonard was. Penny's relationship with David ends when she finds out he is married.
