 "The Draco Tavern" series of short stories take place in a more light-hearted science fiction universe, and are told from the point of view of the proprietor of an omni-species bar.The whimsical "Svetz" series consists of a collection of short stories, "The Flight of the Horse", and a novel, "Rainbow Mars", which involve a nominal time machine sent back to retrieve long-extinct animals, but which travels, in fact, into alternative realities and brings back mythical creatures such as a Roc and a Unicorn.Much of his writing since the 1970s has been in collaboration, particularly with Jerry Pournelle and Steven Barnes, but also Brenda Cooper and Edward M. Lerner.