Jon Norenburg is a research zoologist and curator of Nemertea in the Department of Invertebrate Zoology, NMNH. He has been interested in nemerteans for more than 30 years, during which he has probed their general biology, reproductive biology, life history, their anatomy with light and electron microscopy, and their phylogeny with molecular genetics. Systematics provides the unifying structure for these interests, with the goal being an understanding of the evolutionary diversification of the phylum. Carcinonemertes is of interest for its potential as an economic pest as well as for the evolutionary questions it evokes. Interstitial nemerteans have also been a special interest because they are particularly amenable to detailed comparative and evolutionary study.