Lindenmayer (born 1925) and Prusinkiewicz (born 1952) are older.
https://en.wikipedia.org/wiki/Aristid_Lindenmayer
https://en.wikipedia.org/wiki/Przemys%C5%82aw_Prusinkiewicz
https://en.wikipedia.org/wiki/The_Algorithmic_Beauty_of_Plan...
Re:On generative algorithms
by hapticdata on Thursday September 20, 2018 @03:43PM
(#18034964)
Hard to define a beginning but "The Algorists" such as Roman Verostko, Frieder Nake, Manfred Mohr are probably a better reference for a starting point http://www.verostko.com/algorist.html
Or possibly Lillian Schwartz's work at Bell Labs http://lillian.com/
https://www.doc.gold.ac.uk/~mas01whl/
(or John Conway, but that's another league)