Partner in Nobel Prize-winning Discovery of Muon Neutrino at Brookhaven's Alternating Gradient Synchrotron DOE/Brookhaven National Laboratory Jack Steinberger, who with Leon Lederman and Melvin Schwartz was awarded the 1988 Nobel Prize in physics for their 1962 discovery of the muon neutrino, died on Saturday, December 12, 2020, at his home in Geneva. He was 99. "Jack Steinberger was a remarkable man who played a key role in one of the most impactful discoveries in particle physics of the 20th century," said Doon Gibbs, Director of the U.S. Department of Energy's Brookhaven National Laboratory, which is home to the Alternating Gradient Synchrotron (AGS) used in the prize-winning research. "It made use of a powerful, then-brand-new accelerator to address a frontier question--and is a signature experiment from Brookhaven's early days. We will miss him and send our sincere condolences to his family."