There are a bunch of different OOP mainlines. Some have early Lisp influence, long before CLOS. Some are more or less completely without Lisp influence. Simula

There are a bunch of different OOP mainlines. Some have early Lisp influence, long before CLOS. Some are more or less completely without Lisp influence. Simula, Object Pascal, C++, c#, ... (class based OOP with virtual functions) Smalltalk (message passing, classes) Lisp/CLOS (generic functions) -> Dylan, Perl, Julia, R, ... Actors, Self, JavaScript, ... (Prototypes) ....