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 to 1957, at the U.S. Naval Ordnance Missile Test Facility as head of the Range Operations Division. 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 to one or both of them, most particularly
Have Space Suit—Will Travel. Stine wrote science fiction under the pen name "Lee Correy" in the mid-1950s and under his own name in the 1980s and 1990s, as well as writing science articles for
Popular Mechanics. After White Sands, Stine was employed at several other aerospace companies, finally ending up at
Martin working on the
Titan project. This job was short-lived: he was abruptly fired in 1957 when
United Press called him for a reaction to the launch of
Sputnik 1, and he repeated to them a passage from his just-published book
Earth Satellites and the Race for Space Superiority, in which he wrote, "For the first time since the dawn of history, the Earth is going to have more than one moon. This is due to happen within the next few months—or it may have already happened even at the time you are reading this." The next day he was told to clear out his desk. In his "The Formative Years of Model Rocketry, 1957–1962; A Personal Memoir" (International Astronautical Federation, IAF XXVIIth Congress, Anaheim, CA, October 10–16, 1976 (76-241), he wrote "I was fired by the Martin Company on October 5, 1957, for telling
United Press that the Soviets had used their ICBM as a launch vehicle (which they had), that Sputnik meant that the entire United States was open to nuclear ICBM attack (which it still is), and that the United States was not first in space because we did not have a serious space program (which we did not under the Eisenhower administration)." ==Model rocketry==