Short answers, pulled from the story.
Grumman registered as a business on the 6th of December 1929 and officially opened on the 2nd of January 1930. It was founded by Leroy Grumman and three former colleagues from Loening Aircraft: Edmund Ward Poor, William Schwendler, and Jake Swirbul.
Grumman was the chief contractor for the Apollo Lunar Module, receiving the contract on the 7th of November 1962. The company built 13 lunar modules, six of which successfully landed on the Moon; a seventh served as a lifeboat for the Apollo 13 crew after an explosion crippled the main spacecraft.
Grumman's World War II aircraft included the F4F Wildcat, the F6F Hellcat (12,275 built), the F7F Tigercat, the F8F Bearcat, and the TBF Avenger torpedo bomber (2,290 built). Production of most Wildcats and Avengers was subcontracted to General Motors' Eastern Aircraft Division.
Grumman's products were considered so reliable and ruggedly built that the company earned the nickname the "Grumman Iron Works" among workers and the defense community. At its peak in 1986, it was the largest corporate employer on Long Island, with 23,000 employees.
Northrop Corporation bought Grumman for $2.1 billion in 1994, outbidding a $1.9 billion offer from Martin Marietta. The merger formed Northrop Grumman and effectively ended Grumman's operations on Long Island.
After the 1994 merger, Northrop Grumman closed nearly all Grumman facilities on Long Island. The Bethpage plant was converted into a residential and office complex, with the former company headquarters becoming the corporate home of Cablevision. Former aircraft hangars at Calverton became Grumman Studios, a film and television production center.