Diagram of <a href="https://en.wikipedia.org/wiki/Lunar_Orbit_Rendezvous" class="extiw" title="en:Lunar Orbit Rendezvous">Lunar Orbit Rendezvous</a>
probably <a href="https://en.wikipedia.org/wiki/John_Houbolt" class="extiw" title="en:John Houbolt">John Houbolt</a>
1962
NASA