John C. Houboldt was a airplane engineer who worked for NASA, and became interested, in some ways obsessed with, the Moon program that he logically ought to have no role in.
In the late 1950s and early 1960s, there were already, before President Kennedy ever made his speech committing the US to get to the Moon and back before the end of the 1960s, space program scientists were already working on how to do it. There were three basic approaches--the direct approach, using a single large rocket to lift from Earth, land on its tail on the Moon, and return home; Earth rendezvous, lifting smaller units into Earth orbit and the vehicle to reach the Moon there; and lunar orbital rendezvous. Lunar orbital rendezvous is the methods used in the end: the command module waiting in lunar orbit while the lunar lander brought two members of the crew to the surface of the Moon and back.
