Wow. We lost a giant. I am deeply saddened.
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I don't think you can truly appreciate the quality of his work without seeing some of the competition. When I was diving in the Galapagos, the boat's skipper showed us a reef fish book published by someone else. The best pictures were OK, but only OK. Many were absolutely useless. I tried some fish photography for a while and then realized I was best suited for the absolutely useless variety. His work was consistently excellent.