Mystery Person

Clue 1: I was once offered the presidency of a country I was not a citizen of, but I declined.

Clue 2: A famous photograph captures me playfully sticking my tongue out at photographers on my 72nd birthday.

Clue 3: I won the Nobel Prize in Physics in 1921, though not for the revolutionary theory I am most famous for.

Clue 4: My last name has become a common household synonym for an extraordinarily intelligent person.

Clue 5: I am the theoretical physicist who developed the theory of relativity and the famous equation E=mc².