Stine and his wife Barbara were friends of author Robert A. Heinlein, who sponsored their wedding, as Harry's parents were dead and Barbara's mother too ill to travel. Several of Heinlein's books are dedicated one or both of them, most particularly Have Space Suit - Will Travel. Stine also wrote science fiction under the pen name "Lee Correy" in the mid-1950s, as well as writing science articles for Popular Mechanics.

(hardback, as Lee Correy)
Starship Through Space, Henry Holt, 1954
Rocket Man, Henry Holt, 1955

Stine grew up in Colorado Springs and attended New Mexico Military Institute and Colorado College in Colorado Springs, majoring in physics. Upon his graduation he went to work at White Sands Proving Grounds, first as a civilian scientist and then, from 1955–1957, at the U.S. Naval Ordnance Missile Test Facility as head of the Range Operations Division.

Earth Satellites and the Race for Space Superiority, 1957
Rocket Power and Space FLIGHT, Henry Holt & Co., 1957
Man and the Space Frontier, 1962
The Third Industrial Revolution, Putnam, 1975 ISBN 0-399-11552-8
Shuttle into Space: A Ride in America's Space Transportation, 1978
The Third Industrial Revolution, Ace Science Fiction, May 1979 ISBN 0-441-80664-3
The Space Enterprise, Ace Science, August 1980 ISBN 0-441-77756-2
Confrontation in Space, Prentice-Hall, 1981
Space Power, Ace Science, September 1981 ISBN 0-441-77744-9
The Space Enterprise, 1982
The Hopeful Future, MacMillan, 1983 ISBN 0-02-614790-4
The Silicon Gods, Dell, October ISBN 0-440-08048-7, 1984
The Untold Story of The Computer Revolution, Arbor House, 1984 ISBN 0-87795-574-3
Frontiers of Science: Strange Machines You Can Build, Atheneum, 1985 ISBN 0-689-11562-8
Handbook for Space Colonists, Henry Holt & Co., 1985 ISBN 0-03-070741-2
On The Frontiers of Science, Atheneum, 1985 ISBN 0-689-11562-8
The Corporate Survivors, Amacom Books, 1986 ISBN 0-8144-5831-9
ICBM: The Making of the Weapon That Changed the World, Crown, 1991 ISBN 0-517-56768-7
Mind Machines You Can Build, Top Of The Mountain Publishing, 1992 ISBN 1-56087-075-3
Halfway to Anywhere, M. Evans and Company, N.Y., 1996 ISBN 0-87131-805-9
Living in Space, M. Evans & Co., 1997 ISBN 0-87131-841-5
The Manna Project: Business Opportunities in Outer Space, 1998

MMI was short-lived, as they were unprepared to handle the level of Business they attracted and because of some poor Business decisions. Issues with the production of early engines caused them to seek out Vernon Estes, who came to them in the summer of 1958. Estes's design and construction of "Mabel", the first engine-manufacturing machine, was the foundation of his success and put Estes Industries in a dominant position in the hobby which it was never to relinquish.

The Handbook of Model Rocketry 1st ed., Follet Publishing, 1965
The Handbook of Model Rocketry 2nd ed., Follet Publishing, 1967
The Handbook of Model Rocketry 3rd ed., Follet Publishing, 1970
The Handbook of Model Rocketry 4th ed., Follet Publishing, 1976 ISBN 0-695-80616-5
The Handbook of Model Rocketry 5th ed., 1985 ISBN 0-668-05360-7
The Handbook of Model Rocketry 6th ed., John Wiley & Sons, 1994 ISBN 0-471-59361-3
The Handbook of Model Rocketry 7th ed., with Bill Stine, Wiley, 2004 ISBN 0-471-47242-5
The Model Rocketry Manual, 1969
The New Model Rocketry Manual, Arco Publishing, 1977
The New Model Rocketry Handbook, Arco Publishing, 1977 ISBN 0-668-04282-6 (paper edition)
The New Model Rocketry Handbook, Arco Publishing, 1977 ISBN 0-668-04030-0 (library edition)

Stine was very interested in the interaction of volunteer/free market Libertarian ideas with space colonization and as a tool of citizen diplomacy and world peace, and so was called to serve as Chair of the Advisory Board of the Libertarian International Organization where he mentored various citizen initiatives until his death. In the wake of his book, The Third Industrial Revolution, he was asked to co-organize the American Astronautical Society 1977 conference on private Space Colonization to re-channel focus away from Space exploration alone, and where he received an award as a Founder of the international space effort. He was interested in the concept of non immediate profit-driven free markets, and was seen as a developer and defender of the "pay it forward" approach with Robert A. Heinlein, a term also popularized in a movie of that name, starring Kevin Spacey and other stars. In addition to The Third Industrial Revolution, he wrote several other books encouraging public awareness of the possibilities of a lucrative and socially beneficial active space industry.

Stine was a founding member of the Citizens' Advisory Council on National Space Policy, and attended several meetings including the 1980 meeting that prepared the space defense policy papers for the Reagan Transition Team. The Council was instrumental in developing the Reagan Strategic Defense Initiative which became known as Star Wars.

(paperback, as G.Harry Stine)
Warbots, Pinnacle Science Fiction, May 1988 ISBN 1-55817-111-8
Warbots #2: Operation Steel Band, Pinnacle Science Fiction, July 1988 ISBN 1-55817-061-8
Warbots #3: The Bastaard Rebellion, Pinnacle Science Fiction, September 1988 ISBN 1-55817-089-8
Warbots #4: Sierra Madre, Pinnacle Science Fiction, November 1988 ISBN 1-55817-132-0
Warbots #5: Operation High Dragon, Pinnacle Science Fiction, January 1989 ISBN 1-55817-159-2
Warbots #6: The Lost Battalion, Pinnacle Science Fiction, April 1989 ISBN 1-55817-205-X
Warbots #7: Operation Iron Fist, Pinnacle Science Fiction, August 1990 ISBN 1-55817-253-X
Warbots #8: Force of Arms, Pinnacle Science Fiction, March 1990 ISBN 1-55817-324-2
Warbots #9: Blood Siege, Pinnacle Science Fiction, September 1990 ISBN 1-55817-402-8
Warbots #10: Guts and Glory, Pinnacle Science Fiction, June 1991 ISBN 1-55817-453-2
Warbots #11: Warrior Shield, Pinnacle Science Fiction, February 1992 ISBN 1-55817-589-X
Warbots #12: Judgement Day, Pinnacle Science Fiction, September 1992 ISBN 1-55817-642-X
Starsea Invaders: First Action, New American Library, August 1993
Starsea Invaders: Second Contact, New American Library, March 1994
Starsea Invaders: Third Encounter, New American Library, May 1995
Open Space (graphic novel, undated)

He died on November 2, 1997, in Phoenix, Arizona, of an apparent stroke.