Editing William Crowther (programmer) (section)

=== Later career ===
Crowther worked at [[Xerox PARC]] from 1976 to 1983.  During this period he met and married Nancy Sanders Burnes in 1980 in [[Palo Alto, California]].  The two of them did a lot of rock climbing with friends in [[Yosemite]] and elsewhere.  In 1983 he left Xerox and went back to Bolt Beranek and Newman in [[Cambridge, Massachusetts]].  He became active with the [[Appalachian Mountain Club]] and every year helped teach rock climbing to beginners. He continued doing that each spring until 2013.

In the 1990s, [[Cisco Systems]] bought the part of BBN where Crowther was working.  He continued to work for Cisco until his retirement in 1997{{Citation needed|date=May 2022}}  to live in [[Delanson, New York]] with his second wife Nancy.