https://en.m.wikipedia.org/wiki/Carl_Hewitt
Wikipedia article is way out of date :-(
There is an up-to-date blog here with links to current articles:
https://professorhewitt.blogspot.com/
I was at Code Mesh in 2018 in London to attend your "ULTRACONCURRENCY IS THE FUTURE OF PROGRAMMING" presentation
Meeting you and Joe Armstrong in the same place has been one of the greatest pleasure of my professional life.
https://en.m.wikipedia.org/wiki/Carl_Hewitt