> The routing protocols of ARPANET were developed at Bolt, Beranek and Newman. Bob Kahn, John McQuillan and William Crowther and maybe David Walden (?) were pr

> The routing protocols of ARPANET were developed at Bolt, Beranek and Newman. Bob Kahn, John McQuillan and William Crowther and maybe David Walden (?) were principal architects of the routing system of the ARPANET. (Vint Cerf) Regarding that question mark, David Walden was actually the software designer and Severo Ornstein his hardware counterpart. Compare: > In 1968 BBN was preparing to bid on the contract from ARPA to develop the ARPANET Interface Message Processors (IMPs) [ARPA68]. Frank Heart, Bob Kahn, Severo Ornstein, and David Walden were the main members of BBN’s proposal team (although other BBN people participated) with Heart as the team leader, Kahn with prior background in the concepts of packet switching, Ornstein as the hardware designer, and Walden as the software designer. Shortly before the due date for BBN’s proposal [BBN68] to ARPA, Will Crowther was added to the team as another (more senior) software person; and after BBN was awarded the contract, Ben Barker was added as a hardware designer and Bernie Cosell as a third software person. BBN was awarded to IMP development contract with a start date of January 1, 1969. [1] https://walden-family.com/bbn/imp-code.pdf https://walden-family.com/bbn/imp-code.pdf BTW, as I've read it, the use of packet switching was all about connection times, connecting from hop to hop versus the time required for establishing a cross-continental circuit switching line. (And yes, packet switching for telephony had once been pitched for its military robustness, but this is not why it was considered for ARPANET.)