Using geochemical markers, he traces dispersal, migration, and population dynamics of marine invertebrates and fish, including clownfish. He has developed methods of correlating the chemical composition of fish ear bones with the water fish live in and travel through. With much of his work in the South Pacific and Caribbean, Simon has been on many cruises, logging 1000 hours of scuba diving and 800 hours in tropical environs. Research Interests Fisheries ecology and oceanography; natural isotopic and elemental markers in marine populations; tracing dispersal and migration pathways of marine fish; stable isotope and trace element chemistry of biogenic aragonite.