B.A., 1956, University of Western Ontario. M.A., 1957, University of Western Ontario. Ph.D., 1963, California Institute of Technology. Assistant Professor, Physics, Cornell University, 1963-66. Associate Professor, Physics, Cornell University, 1966-71. Professor, Physics, Cornell University, 1971-present. Visiting appointments at: Stanford University; CERN, Geneva; UC-Berkeley; University of Chicago; SSC Laboratory, Dallas; University of Texas at Austin; Duke University; Rice University. Fellow, American Physical Society. Author, Geometric Mechanics, second edition, Wiley-VCH, 2007, and Accelerator X-Ray Source, Wiley-VCH, 2006.