Acentech welcomed Leo Beranek for a signing of his new book, Riding the Waves: A Life in Sound, Science and Industry. One of the world's leading experts on acoustics, Leo Beranek served as director of the Electro-Acoustic Laboratory at Harvard University and technical director of the Acoustics Laboratory at the Mass. Institute of Technology before founding the acoustical consulting firm of Bolt Beranek and Newman (BBN). Known for his work in noise control and concert acoustics, Beranek devised the world's largest muffler to quiet jet noise and served as acoustical consultant for concert halls around the world (including the Tanglewood Music Shed, the storied summer home of the Boston Symphony Orchestra) As president of BBN, he assembled the software group that invented both the ARPANET, the forerunner of the Internet, and e-mail.