the group leader of the rocket propulsion development engineering. He stayed here until 1959. Return to Grumman Kelly was drawn back to Grumman, in which he took up the position of assistant chief in propulsion from 1959 to 1960. He was then moved to Grumman's Apollo and Lunar Module proposals. During this time Kelly helped develop the lunar orbit rendezvous concept. In late 1962, Grumman won the $2-billion government contract from NASA. Kelly was promoted to lead the design team for the Lunar Excursion Module (LEM). He was in charge of more than 7,000 employees in design and building the Lunar Module. Kelly's group came up with the idea of a two-stage spacecraft (ascent & descent stage), that would take two astronauts to the Moon's surface while a third astronaut would stay in lunar orbit. Kelly had just turned 40 when Neil Armstrong took his first historic step on the Moon July 20, 1969. During the landing, ice had formed in a fuel line, clogging it. If the heat from the engine defrosted the clog, the fuel could detonate. Luckily for Kelly and the Grumman crew, the problem corrected itself and the crew was able to relax and realize what they had accomplished. In an interview in 1998 Kelly stated, "It was the greatest thing in my career. And, in hindsight, it was even more significant than we thought at the time." However, the experience was not without strain and stress, manifested in a nervous tic he developed during the project. In all, Grumman built fifteen lunar modules, but only six of them had the opportunity to land on the Moon's surface. Each one of these modules had significant upgrades compared to the last one. The Lunar Module is among the most significant accomplishments of Kelly's career, as it is still the only spacecraft that humans have flown to another celestial body. Retirement Kelly retired from Grumman in 1992 after spending 38 years with the company. Soon after his retirement, Grumman merged with Northrop to form Northrop-Grumman and dispersed its operations from Long Island. In the year 2000's Long Island: Our Past poll, Kelly was selected as the fourth favorite person from Long Island's history. He followed behind Robert Moses, Theodore Roosevelt and William Levitt. External links Thomas Kelly explains and demonstrates the Lunar Excursion Module (1966, at Grumman plant on Long Island, episode of Science Reporter, MIT film posted