Was lucky enough to hang out with him and Marvin Minsky at Marvin's home in 2014, which PHW organized as a seminar. A generally surreal experience. Some things I recall: both had great understated senses of humor. PHW and Marvin even at their ages remained interested in 'figuring things out' but also were fond of laughing at what they didn't understand, or rather maybe where their knowledge gaps were. It was immediately clear why they were friends and colleagues.
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