https://www.computerhistory.org/revolution/networking/19/375/2014 https://www.computerhistory.org/revolution/networking/19/375... this, too, mentions Yeager as

https://www.computerhistory.org/revolution/networking/19/375/2014 https://www.computerhistory.org/revolution/networking/19/375... this, too, mentions Yeager as the initial developer, and that CISCO licensed and enhanced his work from Stanford.