Timothy Thomas "Tim" Powers (born February 29, 1952, in Buffalo, New York) is an American science fiction and fantasy author. Powers has won the World Fantasy Award twice for his critically acclaimed novels Last Call and Declare. His 1988 novel On Stranger Tides was optioned for adaptation into the fourth Pirates of the Caribbean film.
Most of Powers's novels are "secret histories": he uses actual, documented historical events featuring famous people, but shows another view of them in which occult or supernatural factors heavily influence the motivations and actions of the characters.
Typically, Powers strictly adheres to established historical facts. He reads extensively on a given subject, and the plot develops as Powers notes inconsistencies, gaps and curious data; regarding his award-winning 2000 novel Declare, Powers stated,
"I made it an ironclad rule that I could not change or disregard any of the recorded facts, nor rearrange any days of the calendar – and then I tried to figure out what momentous but unrecorded fact could explain them all."