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 studying the practice and theory of electrical, electronic, and mechanical engineering.

During the 1970s he joined the Digital Equipment Corporation's Laboratory Data Processing Group and during 1977 relocated to Boston, Massachusetts to manage its sales training program.

[3] He quit DEC during 1979 and began writing full-time, relocating to Orlando, Florida, for a year where he met his third wife Jackie.

[10] Hogan believed 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".

[11] 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".