As one of the nation's leading market-design economists, Alvin E. Roth has helped plan systems that place medical residents in hospitals, children in public schools, and kidneys in sick patients. In recent years, the Harvard professor has helped a number of cutting-edge young economists land jobs at Stanford University, and now he'll be joining them there this fall. "The chance to be a colleague with my former students seemed like a lot of fun," says Mr. Roth, a professor of economics and business administration at Harvard. Mr. Roth, who is 60, will also be joined by...