Robert A Heinlein is considered one of the "Big Three" of classic science fiction (along with Isaac Asimov and Arthur C. Clarke). Heinlein is a seven-time Hugo Award recipient and was given the first Grand Master Nebula Award for lifetime achievement. Heinlein's juveniles alone have influenced generations of scientists, engineers and creators the world over (for instance, it was once estimated that everyone in the Apollo 11 mission control room had read and loved at least one Heinlein novel). His worldwide bestsellers include Have Space Suit--Will Travel, Stranger in a Strange Land, Starship Troopers, Time Enough for Love, and The Moon Is a Harsh Mistress.