Dave Shephard, one of my instructors at USC, passed away recently. One of the good things about USC's film program was the instructors who were not only professionals, but enthusiasts: Tom Holman, who invented the THX sound system and genuinely loved everything audio. Bruce Block, who broke down visual composition in a way that actually made sense to non-graphics laymen. And Dave Shephard, THE film historian.
To my knowledge, David had no advanced degrees, but he was responsible for saving a significant percentage of all the movies that had ever been shot on nitrate stock, transferring them to safety stock and then to video. I remember delivering a paper to him at his lab and getting a brief tour of the facility, from the safety locker to the liquid gate printer to a Steenbeck that had been used by Fellini. "Enthusiast" is the best word for him - a man who truly loved his work. He will be greatly missed.