David Koch, executive vice president of chemical technology for Koch Industries Inc., right, during the Memorial Sloan-Kettering Cancer Center 5th Annual Spring Ball at the Metropolitan Museum in New York. Photographer: Amanda Gordon/Bloomberg
David Koch, executive vice president of chemical technology for Koch Industries Inc., right, during the Memorial Sloan-Kettering Cancer Center 5th Annual Spring Ball at the Metropolitan Museum in New York. Photographer: Amanda Gordon/Bloomberg
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