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Though having studied mathematics at Dartmouth College and Harvard University, I was a weather forecaster for the United States Army Air Corps during World War II.

As a meteorologist after the war, I proposed a twelve-variable mathematical model for the movement of air in the atmosphere.

When studying weather patterns, I noticed how minute variations led to large unexpected changes in what was predicted....I called this the butterfly effect.

Chaos theory capitalized on my "butterfly effect" by describing how the small fluttering of a butterfly's wings slightly impacted the atmosphere and eventually was the cause of a tornado somewhere elese in the world.

In 1991, I was awarded the Kyoto Prize for "profoundly [influencing] a wide range of basic sciences and brought about one of the most dramatic changes in mankindís view of nature since Sir Isaac Newton."

I was an active outdoorsman, expecially enjoying hiking, climbing, and cross-country skiing up until my death at age 90 in April of 2008.

Answer: Edward Norton Lorenz (1917-2008)