My interests include the diversification of life through time, quality of the fossil record, shapes of phylogenies, age-clade congruence, mass extinctions, Triassic ecosystem evolution, basal diapsid phylogeny, basal archosaurs and the origin of the dinosaurs.
Current research projects focus on the end-Permian mass extinction, the greatest mass extinction of all time, and especially its effects on terrestrial organisms. This involves fieldwork in Russia and China. I am also working on large-scale aspects of dating the tree of life, the use of phylogenetic means to assess the quality of the rock and fossil records, and studying macroevolution using comparative phylogenetics approaches.
