Past research interests include classical crustacean systematics, ecology, and biogeography. More recently, focus has shifted to crustacean molecular systematics and evolution. Ongoing research projects encompass the use of nuclear 1 8S ribosomal DNA sequence data to infer higher-order phylogenetic relationships among the major crustacean taxa. Molecularly based phylogeneies can then be used as an independent test of evolutionary theories based on morphological characters. Additional projects include the use of mitochondrial DNA sequence data to address questions of crustacean speciation.