As an assistant professor at the University of Michigan in 1913, Oskar Klein invented the idea that extra dimensions may be physically quite real, though smaller than ours, and that they could lead to the observed forces beyond gravity when looked at from our four-dimensional world. (This idea was studied independently by T. Kaluza and is now called Kaluza-Klein theory.) Klein's impact on physics is much broader -- the Klein-Gordon equation is still used daily, and his name is associated with several additional major accomplishments.
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Bron: http://feynman.physics.lsa.umich.edu/klein/klein.html