Biographies of Scientists

Beginner

Surely You're Joking, Mr. Feynman! Richard Feynman

Easy

Einstein: His Life and Universe Walter Isaacson The Man Who Knew Infinity (Ramanujan) Robert Kanigel

Medium

Genius: The Life and Science of Richard Feynman James Gleick The Strangest Man (Dirac) Graham Farmelo

Hard

Never at Rest (Newton) Richard Westfall

Extreme

Subtle Is the Lord (Einstein) Abraham Pais