William E. Roos (May 25, 1911, Pittsburgh, Pennsylvania – March 1, 1987, United States) was an American novelist, playwright, and screenwriter. He authored works using both his own name and the pseudonym William Rand. He also co-authored several works with his wife, the writer Audrey Roos, under the pen name Kelley Roos. These included more than twenty mystery novels; nine of which featured the married sleuths Jeff and Haila Troy. In 1961 the couple won the Edgar Allan Poe Award from the Mystery Writers of America.[1] As a solo writer he authored several plays which were staged on Broadway and multiple teleplays for American television.