Surrounded by members of his family, Bill Siebert died October 25, 2015 at Emerson Hospital in Concord, MA from complications of heart disease. Born in Pittsburgh, PA, Nov. 19, 1925, the son of Charles T. and Isabelle McConway Siebert, he lived most of his life in Concord, MA with his beloved wife Anne Decker (Sandy) Siebert (d. 2000). They raised five children in the Conantum neighborhood: Charles (deceased); Tom married to Betsy of Concord; Peter married to Candace Nelson, also of Concord; Terry and her husband Tom Kuniholm of Bainbridge Island, WA; and Ted and his wife Lana Fuller, also of Bainbridge Island. There are eight grandchildren. Bill's entire career was spent at M.I.T. starting as an undergraduate during WWII, when he also held a commission as Ensign, US Navy. Following a brief stint as Jr. Engineer at Westinghouse Corp, he returned to M.I.T. as a doctoral student and then professor in the Electrical Engineering and Computer Science department, where he was named the Ford Professor of Engineering in 1984. His research on radar at Lincoln Labs in the early 50's produced the first system capable of simultaneously measuring a target's range and velocity, for which he was awarded the 1988 Pioneer Award of the IEEE Aerospace and Electronic Systems Society. In later years, his interest in signal processing and communications system theory was applied to modeling of the human auditory system at the neural level. Always a popular lecturer, he became interested in the pedagogical implications of using computer science for engineering education. Beyond his scientific brilliance, Bill's avocational interests were many. His enjoyment of outdoor activities – hiking, canoeing, skiing and particularly sailing – was passed to his children, who fondly remember summer days on Chinook and Gannet and regattas with the Concord Sailfish Association. where Bill took home more than his share of trophies. He also led them into the mountains of Maine and NH, hiking and skiing, especially around Jackson, NH where Bill and Sandy settled in retirement. In the arts, Bill went on from college gigs as a jazz clarinetist to become a founding member and president of the Concord Band. He was also an accomplished actor, active with the Concord Players for 25 years, both on stage and behind the curtains, including a term as president. In 1972 he led the effort to renovate the Veterans Building in Concord to create the Performing Arts Center, now called 51 Walden, as a home for those two groups and others. He reprised this role in1996 to help establish the Mountain Top Music Center in Conway, NH. Bill and Sandy loved to travel; following her death, he was often joined by his close friend and companion, Eunice Knight. Memorial services will be held on Friday, January 15th at 3 PM in the First Parish in Concord, 20 Lexington Road, Concord. Please consider making a donation in his memory to the Concord Band (www.concordband.org), Concord Players (http://www.concordplayers.org), or Mountain Top Music Center, Conway, NH (www.mountaintopmusic.org).