sentences:  He obtained his bachelor's degree from Harvard University in 1977 and his master's from Stanford University in 1980.His PhD was on "Wave Propagation and Stability for Finite Difference Schemes" supervised by Joseph E. Oliger at Stanford University.Following his PhD, Trefethen went on to work at the Courant Institute of Mathematical Sciences in New York, Massachusetts Institute of Technology, and Cornell University, before being appointed to a chair at the University of Oxford and a Fellowship of Balliol College, Oxford.