Richard Leibler
Encyclopedia
Richard Leibler was an American mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

 and cryptanalyst. Richard Leibler was born in March 1914. He received his A.M. in mathematics from Northwestern University
Northwestern University
Northwestern University is a private research university in Evanston and Chicago, Illinois, USA. Northwestern has eleven undergraduate, graduate, and professional schools offering 124 undergraduate degrees and 145 graduate and professional degrees....

 and his Ph.D. from the University of Illinois in 1939. While working at the NSA, he and Solomon Kullback
Solomon Kullback
Solomon Kullback was an American cryptanalyst and mathematician, who was one of the first three employees hired by William F. Friedman at the US Army's Signal Intelligence Service in the 1930s, along with Frank Rowlett and Abraham Sinkov. He went on to a long and distinguished career at SIS and...

 formulated the Kullback-Leibler divergence, a measure of similarity between probability distributions which has found important applications in information theory
Information theory
Information theory is a branch of applied mathematics and electrical engineering involving the quantification of information. Information theory was developed by Claude E. Shannon to find fundamental limits on signal processing operations such as compressing data and on reliably storing and...

.

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