Gretar Tryggvason is currently the viola D. Hank Professor of Aerospace and Mechanical Engineering at the University of Notre Dame. He served as the Head of the Department of Mechanical Engineering at Worcester Polytechnic Institute from 2000 to 2010, and before that he was an assistant, associate and fill professor of Mechanical Engineering and Applied Mechanics at the University of Michigan in Ann Arbor for fifteen years. Tryggvason received his doctorate from Brown University in 1985 and spent a year as a postdoctoral researcher at the Courant Institute. He has also held short term visiting positions at Caltech, NASA Lewis Engineering Research Center, University of Marseilles, and University of Paris VI. Professor Tryggvason is best known for developing, with his students and collaborators, a front tracking method for direct numerical simulations of multiphase flows and the use of this method to examine several systems, including bubbly flows, droplet motion and boiling. He is the author of over hundred journal papers and numerous other publications. and has supervised over twenty doctoral dissertations. Tryggvason is an active member of several professional societies, a fellow of the American Physical Society and ASME, and the editor- in-chief of the Journal of Computational Physics.