Too much to not mention: davidw, antirez, and Richard Hipp (SQLite) are all current or former heavy hitters in the Tcl world. David contributed to the second ed. of Tcl and the Tk Toolkit[0], co-authored Rivet[1] (an Apache httpd Tcl module), among other things. antirez wrote Tcl the Misunderstood[2] and Jim[3], a lighter weight Tcl implementation, and Richard (drh) is a former Tcl Core Team member[4] who describes SQLite as “a Tcl extension that escaped into the wild.”[5]
[0] https://www.pearson.com/us/higher-education/program/Ousterho...
[1] https://tcl.apache.org/rivet/
[2] http://antirez.com/articoli/tclmisunderstood.html
[3] http://jim.tcl.tk/index.html/doc/www/www/index.html
[4] https://en.m.wikipedia.org/wiki/D._Richard_Hipp
[5] https://www.tcl.tk/community/tcl2017/assets/talk93/Paper.htm...