Yoji Kondo (近藤 陽次? Kondō Yōji, born 1933) is a Japanese astrophysicist who also writes science fiction under the pseudonym Eric Kotani. He edited Requiem: New Collected Works by Robert A. Heinlein and Tributes to the Grand Master (1992), and contributed to New Destinies, Vol. VI/Winter 1988 — Robert A. Heinlein Memorial Issue (1988), after his friend, writer Robert A. Heinlein, died in 1988.
Kondo also edited the non-fiction book Interstellar Travel & Multi-Generational Space Ships, part of the Apogee Books Space Series.
Kondo is also an accomplished teacher of Aikido and Judo.
"Act of God", Eric Kotani & John Maddox Roberts, Baen Books (1985, Baen e-book March 2013).
"The Island Worlds", E. Kotani & J.M. Roberts, Baen (1987, Baen e-book March 2013).
"Between the Stars", E. Kotani & J.M. Roberts, Baen (1988, Baen e-book April 2013).
"Delta Pavonis", E. Kotani & J.M. Roberts, Baen Books (1990, Baen e-book March 2013).
"Supernova", R. M. Allen & E. Kotani, Avon Books (1991).
"Requiem: New Collected Works by Robert A. Heinlein and Tributes to the Grand Master", ed. Y. Kondo, Tor Books (1992). [It became a Book of the Month selection and made the national best-seller list of the San Francisco Chronicle.]
"Death of A Neutron Star", E. Kotani, Pocket Books (1999).
"Legacy of Prometheus", E. Kotani & J.M. Roberts, Tom Doherty Associates (Tor Books) (2000).
Kotani's short story, "The Edgeworld", is contained in the recent Martin Greenberg-John Helfer anthology "Star Colonies", DAW Books (2000).