I'm glad this made it to HN. While he was the founder of BBN which we all know was involved in ARPANET, you won't find the Internet in his Wikipedia entry. It

I'm glad this made it to HN. While he was the founder of BBN which we all know was involved in ARPANET, you won't find the Internet in his Wikipedia entry. It started as an acoustical consulting firm--the one whose employees started many firms across the US and describe in their lineage from BBN. He was one of the fathers of architectural acoustics, noise control and vibration isolation, and remained active until the end, traveling to conferences, publishing papers and such. I met him in Seattle in 2011 at the spring Acoustical Society of America conference. Genuinely warm of a guy, always interested in others' research.