Mel Gibson

actor

Massimo Pigliucci

professor

Mason Cooley

Masayoshi Son

businessman

Marya Hornbacher

author

Mary Matalin

political-consultant

Mary Leakey

archaeologist

Mary Daly

philosopher

Martin Luther King, Jr.

civil-rights-activist

Mark Twain

author

Mark Helprin

novelist

Mark Batterson

pastor

Marissa Mayer

engineer

Margaret Mead

cultural-anthropologist

Marcus du Sautoy

professor

Manuel Castells

sociologist

Manly Hall

author

Manfred Eigen

chemist

Malcolm Muggeridge

journalist

Mahatma Gandhi

civil-rights-leader