Eugene Wigner (1902-1995): Hungarian-American physicist. He participated in the Manhattan project. Nobel prize winner in 1963.
THE UNREASONABLE EFFECTIVENSS OF MATHEMATICS IN THE NATURAL SCIENCES (1960) 
Wigner is puzzled by the fact that though some mathematics seem to have nothing to do with the actual world (such as complex number) it is still incredibly effective in describing natural phenomena.
“the concepts of mathematics are not chosen for their conceptual simplicity… but for their amenability to clever manipulations and to striking, brilliant arguments”
Physics is about finding laws that can explain regularities in nature.