Kenneth I. Appel
Summary: former chairman of the mathematics department at the University of New Hampshire from 1993 to 2003 who in 1976 helped to push the venerable mathematical proof into the computer age, solving a longstanding problem concerning colors on a map with the help of an IBM computer making billions of decisions.
Cause of Death: Esophageal cancer
Born: October 8, 1932
Died: April 19, 2013
Location: Dover, New Hampshire