development of the "core" Internet Protocol security suite (IPsec) standards, and performed extensive work to secure the Border Gateway Protocol (BGP). BBN also created a series of mobile ad hoc networks starting in the 1970s with DARPA's experimental PRNET and SURAN systems. Later BBN efforts included the networking portions of the Near-term digital radio (NTDR) and High-capacity data radio (HCDR), the Wideband Networking Software in the Joint Tactical Radio System and the Wireless Network after Next (WNaN). It also created the networking portions of the U.S. Army's Mobile Subscriber Equipment (MSE) and Canada's Iris Digital Communications System. Notable BBNers A number of well-known computer luminaries have worked at BBN, including Daniel Bobrow, Ron Brachman, John Seely Brown, Edmund Clarke, Allan Collins, William Crowther, John Curran, Chip Elliott, Wally Feurzeig, Ed Fredkin, Bob Kahn, Steve Kent, J. C. R. Licklider, John Makhoul, John McCarthy, Marvin Minsky, Dan Murphy, Severo Ornstein, Seymour Papert, Craig Partridge, Radia Perlman, Oliver Selfridge, Cynthia Solomon, Bob Thomas, Ray Tomlinson, Bill Woods, and Peiter "Mudge" Zatko. Former BBNer Dedre Gentner is Alice Gabrielle Twight Professor of Psychology at Northwestern University. Former board members include Jim Breyer, Anita K. Jones and Gilman Louie. Spin-offs and mergers In 1971, BBN's TELCOMP subsidiary was sold. In the 1970s, BBN created Telenet, Inc., to run the first public packet-switched network. In 1983, BBN Instruments was sold to Vibro-Meter Corp. In 1989, BBN's acoustical consulting business was spun off into a new corporation, Acentech Incorporated, located across the street from BBN headquarters in Cambridge. In 1994, LightStream Corp., a joint venture with Ungermann-Bass, Inc. created in 1992 to manufacture asynchronous transfer mode (ATM) switches, was sold to Cisco Systems Inc. US$120 million. BBN formed an early Internet service provider in 1994 as its BBN Planet division. Previously traded as "BBN" on the stock market, the company was purchased by GTE in 1997 as a wholly owned subsidiary. BBN Planet was joined with GTE's national fiber network to become GTE Internetworking, "powered by BBN". When GTE and Bell Atlantic merged to become Verizon in 2000, the Internet service provider division of BBN was included in assets spun off as Genuity to satisfy Federal Communications Commission (FCC) requirements, leaving behind the remainder of BBN Technologies. Genuity was later acquired out of bankruptcy by Level 3 Communications in 2003. In March 2004, Verizon sold the remainder of the company, by then known as BBNT Solutions