By GLENN RIFKIN OCT. 17, 2016 Leo L. Beranek in Symphony Hall in Boston in 2003. An expert in acoustics, he improved the sound in several concert venues. Credit Rick Friedman/Corbis, via Getty Images Leo L. Beranek, an engineer whose company designed the acoustics for the United Nations and concert halls at Lincoln Center and Tanglewood, then built the direct precursor to the internet under contract to the Defense Department, died on Oct. 10 at his home in Westwood, Mass. He was 102.His death was confirmed by his son James. Dr. Beranek taught acoustic engineering at Harvard and M.I.T. for more than three decades after World War II, conducting research there that laid the groundwork for acoustic advances with wide social impact, including noise standards for public buildings and airports. But one of his most notable achievements was well outside the field of acoustics. In 1969, the company he helped found, Bolt, Beranek & Newman, won a contract from the Defense Departm...