 He was one of the best-selling science-fiction novelists for many decades, and he, Isaac Asimov, and Arthur C. Clarke are often considered the "Big Three" of English-language science fiction authors.Notable Heinlein works include "Stranger in a Strange Land", "Starship Troopers" (which helped mold the space marine and mecha archetypes) and "The Moon Is a Harsh Mistress".His work sometimes had controversial aspects, such as plural marriage in "The Moon is a Harsh Mistress", militarism in "Starship Troopers" and technologically competent women characters that were strong and independent, yet often stereotypically feminine – such as "Friday".