His works (especially his early works) tend toward relatively hard science, with minor expansions to scientific laws. Notably, his first book is entirely about scientific research. However, his later works tended to overshadow this with Filibuster Freefall - the original Trope Namer, "The Brain Eater", was a term used by James Nicoll to refer to the problems with later works by Hogan, among others.
His works include:
- The Giants Series:
- Inherit The Stars (1977)
- The Gentle Giants of Ganymede (1978)
- Giants' Star (1981)
- Entoverse (1991)
- Mission To Minerva (2005)
- The Two Faces Of Tomorrow (1979)
- Thrice Upon A Time (1980)
- Voyage From Yesteryear (1982)
- Code Of The Lifemaker (1983)
- The Immortality Option (1995) - sequel to Code of the Lifemaker
- The Proteus Operation (1985)
Manga comics based on some of his works were made:
- Hoshi o Tsugu Mono - adaptation of Inherit The Stars.
- Mirai kara no Hotline - adaptation of Thrice Upon a Time.
- Mirai no Futatsu no Kao - adaptation of The Two Faces of Tomorrow, translated back to English by Dark Horse Comics.
His works provides examples of:
- Filibuster Freefall: His later works; as noted above, he was one of the original people described by the former Trope Namer, "The Brain Eater". In particular, his later works tended toward AIDS denialism, Velikovskyist catastrophism, and distrust of science.
- Mohs Scale of Science Fiction Hardness: Early works tend toward a 3 or 4, presented as a 5 - he'll add some new possibilities such as Artificial Gravity or Time Travel but present them as logical outgrowths of scientific research. His science got softer in later works.