Morwood was born Robert Peter Smyth in Lisburn, County Antrim, Northern Ireland, and lived there for more than thirty years. From 1969 to 1975 he attended Friends School Lisburn, a Quaker-operated primary and middle school, and then Queen's University in Belfast, where he studied English literature and acquired an honors Bachelors degree with an emphasis on middle-English poets such as Chaucer. During this period Morwood also took pilot training as a cadet pilot with the Queen's University Student Air Squadron of the Royal Air Force; though budgetary considerations (on the Air Force's side) forced Morwood to make a choice between his degree studies and his further studies as a pilot. He chose to continue his work in English literature, and subsequently resigned his commission.

After graduation from university in 1979, Morwood took a position in the UK's Civil Service as a clerk working for the Customs and Excise. During this period he began work on his first novel, which he submitted and sold in 1982. He adopted the pen name "Peter Morwood" in honor of his mother, whose maiden name was Morwood. (He legally changed his surname to match the pen name in the mid-1980s.) His second and third novels were published in 1984 and 1986.

At a science fiction convention in Glasgow, Scotland in 1985, Morwood was introduced by author Anne McCaffrey to his future wife, the fantasist and science fiction writer Diane Duane. After several more meetings and a brief courtship, Morwood asked Duane to marry him, and they celebrated their engagement at the World Science Fiction Convention in Atlanta, Georgia. Morwood then returned to Northern Ireland to complete his term of employment in the Civil Service, and resigned his post in December 1986. Shortly thereafter he relocated to Los Angeles, California, where Duane was working for the animation studio DiC. They were married at the New England regional science fiction convention, Boskone, on February 15, 1987. Later in 1987, Morwood and Duane relocated briefly to Scotland, and then, after a short period spent roving the United Kingdom, to County Wicklow in Ireland, where the two of them currently reside.

The Book of Years and Clan Wars sequences

These two sequences of books center on a feudal-style realm called Alba and the struggles of various clans for its domination. The first sequence is told from the point of view of Aldric Talvalin, scion of a warrior clan of Alba, who is unwillingly drawn into the bloody intrigues of Alban politics and the machinations of the Drusalan Empire, including its power-behind-the-throne, the evilly scheming and sorcerous Commander Voord.

• The Horse Lord (ISBN 0-88677-178-1)
• The Demon Lord (ISBN 0-88677-204-4)
• The Dragon Lord (ISBN 0-88677-252-4)
• The Warlord's Domain (ISBN 0-88677-458-6)

A fifth book (tentatively titled The Shadow Lord) and a sixth (title as yet indeterminate) are projected.

The four Horse Lords novels have recently been reissued by DAW Books in a pair of two-book omnibus volumes:

• The Book Of Years, Volume 1 (ISBN 0-7564-0306-5)
• The Book Of Years, Volume 2 (ISBN 0-7564-0307-3)

In Volume 2, the novel previously published as The Warlord's Domain has been restored to its intended title, The War Lord.

The Clan Wars sequence is (so far) a pair of prequels, telling the story of how the Clan Lords (including Aldric Talvalin's remote ancestors) invaded the land of Alba, settled it, and eventually came to dominate it.

• Greylady (ISBN 0-09-926161-8)
• Widowmaker (ISBN 0-09-931241-7)

A third volume (tentatively titled Cradlesong) is projected.

Tales of Old Russia

This series, densely interwoven with motifs from Russian folktale and legend, tells the story of the young tsar Ivan Khorlovskiy, heir to the throne of the city of Khorlov. Complications instantly ensue when he meets, on a battlefield full of the slain, the sorceress-tsarevna Marya Morevna, "the most beautiful princess in all the Russias", and becomes involved willy-nilly in her entanglement with the ancient and deadly being known as Koschei the Undying. The series goes on to deal humorously with the difficulties of a "two-kingdom household", especially when one partner is both a skilled sorcerer and the mother of one's (rather unusual) children, and -- more seriously -- with the political problems that can beset a small independent tsardom in the face of such threats as the Teutonic Knights and the Golden Horde of the Great Khan.

• Prince Ivan (1990)
• Firebird (1992)
• The Golden Horde (1993)

A fourth volume, The Blue Kremlin, is projected.

Star Trek

Morwood has written one solo Star Trek novel:

• Star Trek: The Original Series #48: Rules of Engagement

He has also collaborated on one with Diane Duane (this novel was written during their honeymoon):

• Star Trek: TOS: Rihannsu #2: The Romulan Way

Other prose works

Morwood has occasionally collaborated with Diane Duane on other novels, primarily in "licensed" universes or shared-world scenarios. These include:

The Space Cops sequence:

1. Mindblast
2. Kill Station
3. High Moon

Others:

1. Keeper of the City
2. SeaQuest DSV

Screen works

Morwood has written various animated scripts, often in collaboration with his wife. These include:

1. Gargoyles: The Hound of Ulster
2. Gargoyles: Ill Met by Moonlight
3. Batman, the Animated Series: Red Claw Rising

In 1999, Morwood began development work along with Duane on a live-action retelling of one of the great German epics, the Nibelungenlied. The script they wrote between late 2002 and mid-2003 was produced as a miniseries for the German satellite network Sat.1 by Tandem Communications of Munich, in association with Sony/Columbia Pictures. Directed by Uli Edel, the miniseries, under the title Die Nibelungen, won a DIVA Award for best German movie-for-TV of 2004. A feature version, entitled Sword of Xanten in the UK, screened there late in 2004; a "megafeature" cut of the entire miniseries aired on Channel Four television in the UK in December 2005.

The miniseries had its premiere USA airing on the Sci-Fi Channel in late March 2006 under the title The Dragon King. It has also been released on DVD in the US and many other markets, under various titles (the previous US title is Curse of the Ring.)