Anson MacDonald

Penname of Robert A. Heinlein which he used in the early 40s for some of his most well-known stories when they were not in a recognizable Heinlein universe:

1940: "Solution Unsatisfactory"
1941: "By His Bootstraps", "Sixth Column"
1942: "Waldo", "Goldfish Bowl", "Beyond This Horizon"

The name is derived from his full name: Robert Anson MacDonald Heinlein.