John J. Miller (author)

John Joseph Miller (a.k.a. J.J. Miller, John J. Miller, and John Jos Miller), born 1954 in New York state, is a New Mexico 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 also published nine novels, and nearly 30 short stories and eight comic book scripts. 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.
Miller is also a Fellow of the Society for American Baseball Research (SABR) and is an authority on America's Negro league baseball of the 20th Century.