He and his wife Loretta have given millions of dollars to educational and health-related charities, including donations to the University of Toronto and Ryerson University.

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In another talk, Ryerson University graduate researcher Paul Vet showed that geotagged tweets themselves can be aggregated to determine sensitive details like where a user lives or works.

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Carney, associate professor at Ryerson University in Toronto.

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"For a lot of us, it had been a little while since we had graduated from college, and it was great just to feel that atmosphere again, " said Mr. Baird, 41, a graduate of Ryerson University in Toronto.

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Clarke, visionaries like Carl Sagan and movies like "2001: A Space Odyssey, " he studied aerospace and industrial engineering at Ryerson University, then physics and astronomy at the University of Toronto, before moving to Cornell to study space science, where he became special assistant to Sagan.

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