William A. Cassidy

William A. Cassidy is an American geologist and professor emeritus of Geology and Planetary Science at the University of Pittsburgh. Cassidy was responsible for recognizing that Antarctica represented the greatest repository of meteorites on earth. Starting in the early 1970s, Cassidy led most major meteorite expeditions to the south polar region, and in 1979, he was awarded the Antarctica Service Medal.

The Cassidy Glacier in Antarctica is named for him, and the mineral Cassidyite is named in his honor.

Cassidy assisted the NTSB with the investigation into TWA flight 800. Cassidy estimate that a meteor strike that could damage to an aircraft would occur over the US once every 59,000 to 77,000 years.

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