History of Smalltalk – Computer Science – Snap! Forum https://forum.snap.berkeley.edu/t/history-of-smalltalk/12103
This talk on the history of Smalltalk on Sept 1 may be of interest:  https://go.computerhistory.org/webmail/827063/295410609/5f8c7dfd62303ce26fd30bb7d909b6d081e8781f641d5f92053730825d0ccb86
while for Brian the path was from LISP / Logo / etc. to Snap!