Fresno, Calif.

Fresno, Calif.

David McDonald
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How'd he get so rich? McDonald bought security and surveillance systems company Pelco in the early 1980s and, after taking it global, sold to French conglomerate Schneider Electric in 2007 for $1.7 billion. Among Pelco's clients are Buckingham Palace, the Statue of Liberty, and China's Presidential Palace.

Learn more about Pelco.