His work emphasized solving hard problems in theoretical nuclear physics with ground-breaking calculations. He was a co-author of the widely-used Ptolemy code for direct heavy-ion reactions, contributed significantly to the development of the Speakeasy computer language, and was a leader in the application of quantum Monte Carlo methods in nuclei. He also advised and helped colleagues at Argonne and around the world in many crucial ways. (And he made movies, as above). He was a Fellow of the American Physical Society, a recipient of the 2000 University of Chicago Medal for Distinguished Performance at Argonne National Laboratory, and of the 2010 American Physical Society Tom W. Bonner Prize in Nuclear Physics.