C. Boyden Gray

American lawyer — White House Counsel to George H.W. Bush — US Ambassador to the EU — who was instrumental in drafting the 1990 Clean Air Act Amendments and creating the acid rain cap-and-trade program.

Creates the acid rain cap-and-trade system — Gray's work on the 1990 Clean Air Act's cap-and-trade mechanism for sulfur dioxide became the most successful environmental regulatory innovation of the 20th century and the template for subsequent carbon trading schemes.