Research Interests

My research interests are in fields of geochemistry and geomicrobiology. The goal of my research is to understand the impact of microorganisms on the chemical cycling of inorganic elements. I employ microscopic, spectroscopic and genetic techniques to investigate microbe-metal interactions that occur in geologic environments. The principal area of my current work is focused on elucidating the basic mechanisms of microbial-mediated redox transformations of Hg, Se and As.

Previous and Current Grant Funding

Title of Project: Microbial Oxidation of Hg(0)
Funding Agency: Department of Energy - SBR
Role: Principal Investigator

Title of Project: Evolutionary map of life's electronic circuits
Funding Agency: Gordon and Betty Moore Foundation
Role: Co-Principal Investigator (PI: P. Falkowski)

Title of Project: Molecular studies of dissimilatory selenium reduction by subsurface microorganisms
Funding Agency: NSF - Geobiology and Low Temperature Geochemistry
Role: Principal Investigator

Title of Project: Prebiotic evolution of redox chemistry on Earth
Funding Agency: NSF - Molecular and Cellular Biosciences
Role: Co-Principal Investigator (PI: P. Falkowski)

Title of Project: Reduction of mercury in saturated subsurface sediments and its potential to mobilize mecury in its elemental form
Funding Agency: Department of Energy - ERSP
Role: Co-Principal Investigator (PI: T. Barkay)

Title of Project: The kinetics and mechanisms of selenium reduction by soil microorganims
Funding Agency: USDA-NRI: Soil Processes
Role: Principal Investigator

Title of Project: The biogeochemsitry of Pb transformations mediated by phosphate- releasing bacteria
Funding Agency: NJWRRI
Role: Principal Investigator (sole PI)