OOP and Actor model followed parallel paths of evolution: the Actor Model was created by Carl Hewitt based on the message passing semantics of Smalltalk. Alan K

OOP and Actor model followed parallel paths of evolution: the Actor Model was created by Carl Hewitt based on the message passing semantics of Smalltalk. Alan Kay, in turn had based the message passing semantics of Smalltalk on the goal-driven evaluation of PLANNER, which was designed by Carl Hewitt. PLANNER was the precursor to Prolog. Erlang a language based on actor model where processes are actor was originally not intended to be a language, rather it started out as a library for fault-tolerant distributed programming in Prolog, and later evolved into a dialect of Prolog, before it became its own language, still to this day heavily influenced by Prolog. So, the similarities between Objects in OO, and Actors in the Actor Model are far from coincidental.