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There's one thing on his wikipedia page which I think is probably wrong: I don't think Wirth had any involvement with Object Pascal.

I think he did, as a consultant. The main reference I found was an article in MacTech, written by an Apple employee:

"Object Pascal is an extension to the Pascal language that was developed at Apple in consultation with Niklaus Wirth, the inventor of Pascal."

I was (distantly) there, and I recall Wirth being there and visiting.