GREENHALL, Ken. Also writes as Jessica Hamilton. American, b. 1928. Genres: Novels. Career: Retired editor of reference books and journals. Publications: Childgrave, 1982; The Companion, 1988; Deathchain, 1991; Lenoir: A Novel, 1998. AS JESSICA HAMILTON: Elizabeth, 1976; Baxter, 1977. Address: 3840 Greystone Ave., Apt. 5M, Bronx, NY 10463, U.S.A.