Professor of Mathematics Emeritus, University of Illinois at Chicago

Professor of Mathematics, University of California, Santa Barbara

Syddansk Universitet & UC Berkeley

Professor of Mathematics, Williams College

Professor of Mathematics, Pitzer College

Professor of Mathematics, University of South Alabama

The University of Warwick

Professor of Mathematics, University of South Alabama

Professor of Mathematics, University of Tennessee

Emeritus Professor, Osaka City University (New Name: Osaka Metropolitan University))