prof.dr. Luitzen Egbertus Jan Brouwer

Wikipedia Biographical Summary:

"...Luitzen Egbertus Jan Brouwer (February 27, 1881 – December 2, 1966), usually cited as L. E. J. Brouwer but known to his friends as Bertus, was a Dutch mathematician and philosopher, a graduate of the University of Amsterdam, who worked in topology, set theory, measure theory and complex analysis.[1][4][5] He was the founder of the mathematical philosophy of intuitionism..."

SOURCE: http://en.wikipedia.org/wiki/Luitzen_Egbertus_Jan_Brouwer