His most outstanding book The Last Unicorn (1997) was published in 1968 and has also become well-known as an animated film, the script of which was written by the author himself. In 1987, The Last Unicorn was ranked fifth in the All Time Best Fantasy Novel.
Peter made his debut at the age of 19 with his novel A Fine and Private Place (2011) - a kind story about love and death, the desire for life as well as the fear of it. Now this novel belongs to modern classics.
Other outstanding titles include The Folk of the Air (1986), Tamsin (1999), Summerlong (2016) or the captivating lyrical novel In Calabria (2017).
Peter writes not only novels, but also shorter prosaic forms, the most famous of which is the short story Come, Lady Death (1963) and the novel Two Hearts (2011). Come, Lady Death was published in The Fantasy Hall of Fame II (1992) – an anthology of the best fantasy short stories of all time. Peter adapted this short story into libretto The Midnight Angel (1993). The novel Two Hearts, which continues from the novel The Last Unicorn, has won many awards such as the Hugo Award for Best Novellet (2006) or the Nebula Award (2007).
In addition to his literary work, he occasionally works for film and television. He wrote screenplay for the animated version of The Lord of the Rings (1978) and a script for an episode of the TV series Star Trek: The Next Generation (Sarek, Episode 23, Season 3).
He has won many awards for his literary work including A World Fantasy Award for Life Achievement (2011) and the Damon Knight Memorial Grand Master Award (2018).