Stephen Cole Kleene, Date of Birth, Place of Birth, Date of Death

Stephen Cole Kleene

American mathematician and theoretical computer scientist

Date of Birth: 05-Jan-1909

Place of Birth: Hartford, Connecticut, United States

Date of Death: 25-Jan-1994

Profession: computer scientist, mathematician, university teacher, philosopher

Nationality: United States

Zodiac Sign: Capricorn

Stephen Cole Kleene ( KLAY-nee; January 5, 1909 – January 25, 1994) was an American mathematician.
One of the students of Alonzo Church, Kleene, along with Rózsa Péter, Alan Turing, Emil Post, and others, is best known as a founder of the branch of mathematical logic known as recursion theory, which subsequently helped to provide the foundations of theoretical computer science.
Kleene's work grounds the study of computable functions.
A number of mathematical concepts are named after him: Kleene hierarchy, Kleene algebra, the Kleene star (Kleene closure), Kleene's recursion theorem and the Kleene fixpoint theorem.
He also invented regular expressions in 1951 to describe McCulloch-Pitts neural networks, and made significant contributions to the foundations of mathematical intuitionism.