Dr Jerry Eugene Pournelle was an American science fiction writer, engineer, essayist, and journalist, who contributed for many years to the computer magazine Byte, and from 1998 until his death maintained his own website and blog. From the beginning, Pournelle's work centered around strong military themes. Several books describe the fictional mercenary infantry force known as Falkenberg's Legion. There are strong parallels between these stories and the Childe Cycle mercenary stories by Gordon R. Dickson, as well as Heinlein's Starship Troopers, although Pournelle's work takes far fewer technological leaps than either of these. Pournelle spent years working in the aerospace industry, including at Boeing, on projects including studying heat tolerance for astronauts and their spacesuits. This side of his career also found him working on projections related to military tactics and probabilities. One report in which he had a hand became a basis for the Strategic Defense Initiative, the missile defense system proposed by President Ronald Reagan. A study he edited in 1964 involved projecting Air Force missile technology needs for 1975. Dr. Pournelle would always tell would-be writers seeking advice that the key to becoming an author was to write—a lot. “And finish what you write,” he added in a 2003 interview. “Don’t join a writers’ club and sit around having coffee reading pieces of your manuscript to people. Write it. Finish it.” Pournelle served as President of the Science Fiction and Fantasy Writers of America in 1973.

James Patrick Hogan was a British science fiction author. Hogan was 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. James Hogan died unexpectedly from a heart attack at his home in Ireland.