Original sentence: William Karush (1917-03-01 – 1997-02-22) was a professor emeritus of California State University at Northridge and is a mathematican best known for his contribution to Karush-Kuhn-Tucker conditions
Edited sentence: William Karush (1917-03-01 – 1997-02-22) was a professor emeritus of California State University at Northridge and is a mathematician best known for his contribution to Karush-Kuhn-Tucker conditions