I asked the PARC veterans of the Medley Interlisp project whether they interacted with Niklaus Wirth during his sabbaticals at the lab. Ron Kaplan shared a funny early 1970s anecdote on a comment by Wirth on what we now call email notifications:

https://groups.google.com/g/lispcore/c/BiZLQHs6T0s/m/0N7LzgrgAgAJ

Warren was Warren Teitelman. DLisp was an early graphical Interlisp system that predated Interlisp-D:

https://www.mirrorservice.org/sites/www.bitsavers.org/pdf/xerox/parc/techReports/CSL-77-3_A_Display_Oriented_Programmers_Assistant.pdf

#wirth #interlisp #retrocomputing