Exterior Differential Systems and Euler-Lagrange Partial Differential Equations

Robert Bryant is the J. M. Kreps Professor in the Department of Mathematics at Duke University.

Phillip Griffiths is the director of the Institute for Advanced Study and professor in the Department of Mathematics at Duke University.

Daniel Grossman was an L. E. Dickson Instructor in the Department of Mathematics at the University of Chicago at the time of writing, and is now a consultant at the Chicago office of the Boston Consulting Group.