Yvonne Szafran is senior conservator of paintings and Laura Rivers is associate conservator of paintings at the J. Paul Getty Museum. Alan Phenix is a scientist and Tom Learner is head of science at the Getty Conservation Institute. Ellen G. Landau is Andrew W. Mellon Professor Emerita of the Humanities at Case Western Reserve University and has published widely on Abstract Expressionism. Steve Martin is a comedian, actor, musician, writer, and art collector.