Robert Anson Heinlein was an American science fiction author, engineer, and naval officer. He is sometimes called the 'dean of science fiction writers' and was among the first to emphasize scientific accuracy in his fiction, pioneering the subgenre of hard science fiction. Heinlein's published works, both fiction and non-fiction, express admiration for competence and emphasize the value of critical thinking. His plots often presented provocative situations which challenged conventional social mores, making his work distinctive within the science fiction landscape. His influence extends beyond the science fiction genre itself, continuing to shape modern culture more generally.