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. He married three more times and fathered six children.
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 died of a heart attack at his home in Ireland on Monday, 12 July 2010, aged 69.
Hogan also espoused the idea that the Holocaust did not happen in the manner described by mainstream historians, writing that he found the work of Arthur Butz and Mark Weber to be "more scholarly, scientific, and convincing than what the history written by the victors says." Such theories were seen by many[who?] to contradict his views on scientific rationality;[how?] he repeatedly stated that these theories held his attention due to the high quality of their presentation – a quality he believed established sources should attempt to emulate, rather than resorting to attacking their originators.
In March 2010, in an essay defending Holocaust denier Ernst Zündel, Hogan stated that the mainstream history of the Holocaust includes "claims that are wildly fantastic, mutually contradictory, and defy common sense and often physical possibility."
Minds, Machines & Evolution (ISBN978-0-553-27288-8) – June 1988 (Bantam Spectra, republished by Baen, December 1999, short stories and essays)
Star Child (ISBN978-0-671-87878-8) – June 1998 (expansion of "Silver Shoes for a Princess" to a four-story cycle: "Silver Shoes for a Princess", "Silver Gods from the Sky", "Three Domes and a Tower" and "The Stillness Among the Stars")
Rockets, Redheads & Revolution (ISBN0-671-57807-3) – April 1999 (Baen, short stories and essays)
Martian Knightlife (ISBN978-0-7434-3591-8) – October 2001 (two novellas, "His Own Worst Enemy" and "The Kahl of Tadzhikstan", both featuring the Simon Templar-influenced Kieran Thane)
Catastrophes, Chaos & Convolutions (title as published; was to be Catastrophes, Creation & Convolutions) (ISBN978-1-4165-0921-9) – December 2005 (Baen, short stories and essays)
^Hogan, James P. (April 1999). Rockets, Redheads & Revolution. Baen Books. pp. 151–173. ISBN0-671-57807-3."Well here's what happens to politically incorrect science when it gets in the way of a bandwagon being propelled by 'lots' of money- and to a scientist who ignores it and attempts simply to point at what the fact seem to be trying to say."... "The 'side effects' <of AZT> look just like AIDS."
^Hogan, James P. (April 1999). Rockets, Redheads & Revolution. Baen Books. pp. 175–192. ISBN0-671-57807-3."My own belief, if it isn't obvious already, is that the final story will eventually come together along such catastrophist lines."
Truesdale, Dave (18 July 2010). "Classic James P. Hogan Interview". Tangent Online. Retrieved 19 July 2010. Interview originally appeared in Tangent No. 1, July/August 1993, and is reprinted here for the first time.