Hogan was born in London, England. He was raised in the Portobello Road area on the west side of London. After leaving school at the age of sixteen, he worked various odd jobs until, after receiving a scholarship, he began a five-year program at the Royal Aircraft Establishment at Farnborough covering the practical and theoretical sides of electrical, electronic, and mechanical engineering. He first married at the age of twenty, and he has had three other subsequent marriages and fathered six children.
Hogan worked as a design engineer for several companies and eventually moved into sales in the 1960s, travelling around Europe as a sales engineer for Honeywell. In the 1970s he joined the Digital Equipment Corporation's Laboratory Data Processing Group and in 1977 moved to Boston, Massachusetts to run its sales training program. He published his first novel, Inherit the Stars, in the same year to win an office bet. He quit DEC in 1979 and began writing full time, moving to Orlando, Florida, for a year where he met his third wife Jackie. They then moved to Sonora, California.
Hogan's style of science fiction is usually hard science fiction. In his earlier works he conveyed a sense of what science and scientists were about. His philosophical view on how science should be done comes through in many of his novels; theories should be formulated based on empirical research, not the other way around. If a theory does not match the facts, it is theory that should be discarded, not the facts. This is very evident in the Giants series, which begins with the discovery of a 50,000 year-old human body on the Moon. This discovery leads to a series of investigations, and as facts are discovered, theories on how the astronaut's body arrived on the Moon 50,000 years ago are elaborated, discarded, and replaced.
Hogan's fiction also reflects anti-authoritarian social views. Many of his novels have strong anarchist or libertarian themes, often promoting the idea that new technological advances render certain social conventions obsolete. For example, the effectively limitless availability of energy that would result from the development of controlled nuclear fusion would make it unnecessary to limit access to energy resources. In essence, energy would become free. This melding of scientific and social speculation is clearly present in the novel Voyage from Yesteryear (strongly influenced by Eric Frank Russell's famous story "And Then There Were None"), which describes the contact between a high-tech anarchist society on a planet in the Alpha Centauri system, with a starship sent from Earth by a dictatorial government. The story uses many elements of civil disobedience.
His novels include:
Short story collections include:
Non-fiction science writings
In recent years, Hogan's views have tended towards those widely considered "fringe" or pseudoscientific. He is a serious proponent of Immanuel Velikovsky's version of catastrophism, and of the theory that AIDS is caused by pharmaceutical use rather than HIV (see AIDS denialism). He has stated that he finds basic evidence of evolution's being random to be lacking - or to disprove the theory outright, though he doesn't propose theistic creationism as an alternative. Hogan is also skeptical of the alleged Climate change consensus and ozone depletion.
Hogan has also espoused the idea that the Holocaust didn't happen in the manner described by mainstream historians, writing that he finds the work of Arthur Butz and Mark Weber to be "more scholarly, scientific, and convincing than what the history written by the victors says." While such theories are seen by many to contradict his views on scientific rationality, he has repeatedly stated that these theories hold his attention due to the high quality of their presentation - a quality he believes established sources should attempt to emulate, but have instead resorted to attacking their originators. As such, they are consistent with the view that scientific theories should not be accepted simply because they are widely held (see, for instance, argument from authority).