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And co-author of the Raft consensus algorithm! [1]

And Tcl had since the beginning an event loop naturally embedded in the core language. http://wiki.tcl.tk/2567 http://wiki.tcl.tk/1527

Which includes Tk, notable for being a relatively-easy-to-use GUI toolkit that embraces events as described in these slides.

(You probably already know this; just elaborating for those who might not be familiar with Tcl/Tk)

I’ve not used tcl/tk since around 2000, but it was a nice thing to quickly code up some dialog boxes for operations oriented scripts back in the day.

He also has a new book "A Philosophy of Software Design" that is short and worth reading. (I'm currently on chapter 7.)