#WardChristiansen was one of the unkown pioneers. He, along with his friend Randy Seuss, founding the first computer #BBS in Chicago due to a snowstorm. You can read more about Ward here:

https://honoraryunsubscribe.com/ward-christensen/

#Ward also created the #XMODEM protocol in 1977. He was interviewed for the fantastic BBS Documentary by @textfiles , and appears in it at various places, starting here: https://youtu.be/Dddbe9OuJLU?feature=shared&t=405

The raw interview footage is at: https://archive.org/details/20020216-bbs-christensen

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