Philip Josť Farmer
Many of Farmer's works involve reworking existing characters from fiction and history, such as The Other Log of Phileas Fogg, filling in the missing time periods from Jules Verne's Around the World in Eighty Days, and his Riverworld series, which follows the adventures of Richard Burton and Samuel Clemens through a bizarre afterlife in which every human to ever have lived is simultaneously resurrected. This has led to a burgeoning of a particular type of this form of fiction which is frequently referred to by reference to Farmer's original premise, the Wold Newton family.
Farmer wrote Venus on the Half-Shell under the name Kilgore Trout, a fictitious author who appears in the works of Kurt Vonnegut.
Farmer's works often contain sexual themes: his collection of short stories Strange Relations was a notable event in the history of sex in science fiction.