An expert in national planning, he's best known for developing the input-output theory of economic analysis.  
Talk about a cosmopolitan background: he was born in Russia, educated in Germany, and advised the Chinese government before emigrating to the U.S. and becoming a Harvard professor -- at age 25.  An expert in national planning, he's best known for developing the input-output theory of economic analysis.  FTP name the author of The Structure of the American Economy, winner of the 1973 Nobel in Economics.
Talk about a cosmopolitan background: he was born in Russia, educated in Germany, and advised the Chinese government before emigrating to the U.S. and becoming a Harvard professor -- at age 25.  
Wassily Leontief