William Bradley Strickland (born 1947) is an American writer known primarily for fantasy and science fiction. His speculative fiction is published under the name Brad Strickland except for one novel written as Will Bradley. By a wide margin his work most widely held in WorldCat participating libraries is The Sign of the Sinister Sorcerer (Dial Books, 2008), which concluded the Lewis Barnavelt series created by John Bellairs (1938–1991).
When Lewis Barnavelt and Rose Rita Pottinger explore an abandoned theater, they discover an unpublished opera score. Ignoring a strange omen, they show it to their music teacher, who heralds The Day of Doom as a masterpiece. Then eerie Henry Vanderhelm, the composer's grandson, arrives--with a plan to awaken the dead and enslave the world!