Guest Lectures at Academic/Research Institutions:

"Linking microbial ecophysiology and phylogenetics: a case study on biogeochemical redox cycling of iron and nitrogen in anoxic sediments", The University of Alabama, Department of Biological Sciences, October, 2003.
 
“Microbial nitrate-dependent oxidation of solid-phase Fe(II)”, Argonne National Laboratory, Division of Environmental Research, August 2003.
 
“Experimental and modeling analysis of Fe redox cycling kinetics and the influence of microbial Fe(III) oxide reduction on methane production in freshwater wetland sediments”, Auburn University, Department Civil Engineering, September 2002.
 
“Experimental and modeling analysis of Fe redox cycling kinetics and the influence of microbial Fe(III) oxide reduction on methane production in freshwater wetland sediments”, University of Florida, Department of Soil and Water Science, September 2002.
 
“Microbiological and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial ecophysiology”, Argonne National Laboratory, Division of Environmental Research, July 2002.
 
“Immobilization of strontium during iron biomineralization coupled to dissimilatory Fe(III) oxide reduction”, Idaho National Environmental Engineering Laboratory, April 2002.
 
“Microbiological and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial ecophysiology”, Department of Biological Sciences, University of Montana, April 2002.
 
“Mineral breathing microbes: bacterial Fe(III) oxide reduction in ancient and modern sedimentary environments”.  Auburn University, Department of Geology, September 2001.
 
“Microbiological and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial (eco)physiology”, Stanford University, Department of Geological and Environmental Sciences, April 2001.
 
“Microbiological and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial (eco)physiology”, University of New Mexico, Departments of Biology  and Earth and Planetary Sciences, April 2001.
 
“Relief for wetland gas production: interactions between Fe(III) oxide reduction and methanogenesis in freshwater wetland sediments”, Southern Illinois University, Department of Microbiology, November 2000.
 
“Mineral breathing microbes: bacterial Fe(III) oxide reduction in ancient and modern sedimentary environments”.  Summer Research Colloquium Program, Dauphin Island Sea Lab, June 2000.
 
“Microbial and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial physiology”.  University of Odense, Denmark, Danish Earth Sciences Center, June 2000.
 
“Microbial and geochemical controls on bacterial Fe(III) oxide reduction: links between surface chemistry and microbial physiology”.  University of Idaho, Department of Microbiology and Molecular Biology, April 2000.
 
“Relief for wetland gas production: interactions between Fe(III) oxide reduction and methanogenesis in freshwater wetland sediments”, Mississippi State University, Department of Biology, February 1999.
 
“Dynamics of Fe cycling in freshwater aquatic sediments: oxidative vs. reductive kinetics”, UFZ Centre for Environmental Research, Department of Inland Water Research Magdeburg, Magdeburg, Germany, June 1998.
 
“Competitive interactions between Fe(III) oxide reduction and methanogenesis in freshwater wetland sediments”, University of Alabama at Birmingham, Department of Biology, May 1998.
 
“Microbial and geochemical controls on dissimilatory Fe(III) oxide reduction”, University of Wyoming, Department of Geosciences, April 1998.
 
“Dynamics of Fe cycling in freshwater aquatic sediments: oxidative vs. reductive kinetics”, Skidaway Institute of Oceanography, February 1998.
 
“Dynamics of Fe cycling in freshwater aquatic sediments: oxidative vs. reductive kinetics”, Georgia Institute of Technology, School of Earth and Atmospheric Sciences, February 1998.
 
“Relief for wetland gas production: iron oxide suppression of methane production in freshwater wetland sediments”, Lebanon Valley College, Department of Biology, March 1997.
 
“Relative influence of direct microbial Fe(III) oxide reduction vs. Fe-S mineral formation on phosphate mobilization in anaerobic sediments”, Allegheny College, Departments of Biology and Environmental Sciences, October 1995.
 
“Phosphate mobilization in anaerobic wetland sediments: microbial Fe(III) oxide reduction vs. Fe-S mineral formation”, University of Mississippi, Department of Biology, October 1995.
 
“Microbial Fe(III) oxide reduction in anaerobic sediments and culture”, Tulane University, Department of Ecology, Evolution and Organismal Biology, March 1995.
 
“Microbial Fe(III) oxide reduction: controls and environmental significance. The University of Alabama, Department of Biological Sciences, February, 1995.
 
“Microbial Fe(III) oxide reduction in anaerobic sediments and culture”, Dauphin Island Sea Laboratory, April 1994.
 
“Sulfur cycling in Chesapeake Bay sediments”, Lamar University, Department of Biology, February 1994.
 
“Sulfur cycling in Chesapeake Bay sediments”, Florida State University, Department of Oceanography, November 1993.

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