Amos Edward Joel Jr. (March 12, 1918 – October 25, 2008)[1] was an American electrical engineer, known for several contributions and over seventy patents related to telecommunications switching systems.
Joel was born in Philadelphia, and spent portions of his youth living in New York City, where he graduated from DeWitt Clinton High School in the Bronx.
(1942) in electrical engineering from Massachusetts Institute of Technology, where he worked on the Rockefeller Differential Analyzer (project headed by Vannevar Bush), and a thesis on functional design of relays and switch circuits, advised by Samuel H. Caldwell.
[4] The latter invention made mobile telephony widely available by allowing a multitude of callers to use the limited number of available frequencies simultaneously and by allowing the seamless switching of calls from tower to tower as callers traveled.
[5] Joel died in his home in Maplewood, New Jersey, on October 25, 2008, at age 90.