Chamber's thesis was '92 if i'm looking correctly (https://www.cs.tufts.edu/~nr/cs257/archive/craig-chambers/thesis.pdf https://www.cs.tufts.edu/~nr/cs257/archi

Chamber's thesis was '92 if i'm looking correctly (https://www.cs.tufts.edu/~nr/cs257/archive/craig-chambers/thesis.pdf https://www.cs.tufts.edu/~nr/cs257/archive/craig-chambers/th...), Ungar's thesis from '86 greatly predates it: https://archive.org/details/ungar-smalltalk https://archive.org/details/ungar-smalltalk