Philip Kindred Dick was an American science fiction short story writer and novelist. He wrote 45 novels and about 121 short stories, most of which appeared in science fiction magazines. His fiction explored varied philosophical and social questions such as the nature of reality, perception, human nature, and identity, and commonly featured characters struggling against alternate realities, illusory environments, monopolistic corporations, drug abuse, authoritarian governments, and altered states of consciousness. He is considered one of the most important figures in 20th-century science fiction.