Sir Arthur Ignatius Conan Doyle DL (22 May 1859 – 7 July 1930) is a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, generally considered a milestone in the field of crime fiction, and for the adventures of Professor Challenger.

He is a prolific writer whose other works include science fiction stories, plays, romances, poetry, nonfiction and historical novels.