SCHAEFFER, Mark. American, b. 1956. Genres: Children's fiction, Plays/ Screenplays, Librarianship. Career: Visual Education Corp., Princeton, NJ, associate producer, 1978-79, project director, 1979-84; free-lance writer and audiovisual producer, 1984-89; free-lance writer and audiovisual producer in partnership with wife, Debra Goldentyer, 1989-. Founder, Princeton Mime Company; actor in local stage productions. Publications: NONFICTION: (and illustrator) Library Displays Handbook, 1990. PLAYS FOR CHILDREN: (writer and composer with B. Ackerman) Halleyballoo, 1986; (and composer and director) White Nights and Golden Sleigh Rides, 1986-87; (composer, R. Asch) Under the Golden Dome, 1987-88; (composer, R. Asch) Digging the Whole, 1988; (composer, R. Asch) Where Snow Falls Up, 1989. Address: 933 Rose Ave., Oakland, CA 94611, U.S.A.