A brief bibliography:
Prequels to the Book of Years series:
The Clan Wars book 1: Greylady (1993), The Clan Wars book 2: Widowmaker (1994)
Tales from Old Russia series:
Prince Ivan (1990), Firebird (1992), The Golden Horde (1993)
The Space Cops series (with Diane Duane):
#1: Mindblast (1991), #2: Kill Station (1991), #3: High Moon (1992)
The Romulan Way (Star Trek novel, 1987, with Diane Duane), Keeper of the City (1989, with Diane Duane), Rules of Engagement (Star Trek novel, 1990), Seaquest DSV (pilot episode novelisation, 1993, with Diane Duane)
Peter lives in Ireland with his wife and fellow guest Diane Duane.
Visit Diane and Peter's world-famous web-site, the Owl Spring's Partnership.