Donald Davies British (1924-2000). Co-inventor of packet-switching. Packet-switching methodology developed by ARPA incorporated ideas advanced by Americans Leonard Kleinrock, Paul Baran and Lawrence Roberts. Gordon Welchman coined the term “packet” as a unit of digital data, and co-invented packet-switching. Davies visited MIT in early 1960s, observing choke points in advanced timesharing computer systems. Back in the UK, devised “packet switching”, which divided computer messages into packets of code that could be tagged and sent independently, ultimately converging for reconstitution at a singular IP address. Packet-switching was central to the functioning of ARPANET.