Karl Marx (German: [ˈkaʁl ˈmaʁks]; 5 May 1818 – 14 March 1883) was a German philosopher, economist, historian, sociologist, political theorist, journalist and socialist revolutionary.

Peter Graves (born Peter Duesler Aurness; March 18, 1926 – March 14, 2010) was an American film and television actor. He was best known for his role as Jim Phelps in the CBS television series Mission: Impossible from 1967 to 1973 (original) and from 1988 to 1990 (revival). His elder brother was actor James Arness. Graves was also known for his portrayal of airline pilot Captain Clarence Oveur in the 1980 comedy film Airplane! and its 1982 sequel Airplane II: The Sequel.

Stephen William Hawking CH CBE FRS FRSA (8 January 1942 – 14 March 2018) was an English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. He was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009.