Answer: stephenhawking

AnswerCrossword Clue
STEPHENHAWKING1979 Einstein Medal recipient
STEPHENHAWKINGQuiet scientist who wrote "A Brief History of Time"?
STEPHENHAWKING"The Universe in a Nutshell" author
STEPHENHAWKING"A Brief History of Time" author doing sales?
STEPHENHAWKINGAdvertising Sondheim?
STEPHENHAWKINGPhysicist who won a 2009 Presidential Medal of Freedom