Edmond H. Fischer
Edmond Henri Fischer (born April 6, 1920) is an American biochemist. He and his collaborator Edwin G. Krebs were awarded the Nobel Prize in Physiology or Medicine in 1992 for describing how reversible phosphorylation works as a switch to activate proteins and regulate various cellular processes. From 2007 until 2014, he was the Honorary President of the World Cultural Council. He is the oldest living Nobel laureate at age 99.