John J. Miller

Miller was a science fiction author known for his work in the long-running (since 1987) Wild Cards shared universe series of original anthologies and novels, edited by George R. R. Martin. He published nine novels, thirty-one short stories and eight comic book stories. He also wrote GURPS Wild Cards, a supplement for the GURPS role-playing system published in 1989, and two Wild Cards world books and histories published by Green Ronin. -Wikipedia