PhD, Soil Microbiology, University of California, Berkeley, California, 1991
MS, Range Biology, Colorado State University, Fort Collins, Colorado, 1983
BA, Botany, Humboldt State University, Arcata, California, 1981
BA, Range Management, Humboldt State University, Arcata, California, 1981
Microbial ecology and biochemistry
Dr. Stark studies microbial controls on C & N-cycling in natural ecosystems. He is also interested in trace gas production by soil microorganisms, vegetation-microbial community interactions, and the ecology of ammonia-oxidizing bacteria.