Professor Emeritus at the University of California Davis
Distinguished Professor at Southern Illinois University
Associate Adj. Professor at UC Davis, director of FCCL
Assistant Professor, UC Davis Bodega Marine Laboratory
Professor at University of California Davis
Associate Professor at Oregon State University
Professor at University of California Davis
Research Chemist at USGS, California Water Science Center
Professor at the University of California Davis
Associate Professor at the University of Massachusetts
Assistant Researcher at UC Santa Cruz