System maintenance is scheduled for Sunday, Sept. 29, 2019, 10 a.m. – 4 p.m. PDT. This will affect your access to Canvas, the online system hosting your course materials. We’re sorry for the interruption. Please plan ahead.
Ronald Tjeerdema LinkedIn
RONALD TJEERDEMA, Ph.D., D.A.B.T., is an Associate Dean in UC Davis’ College of Agricultural and Environmental Sciences and a professor in the Department of Environmental Toxicology. He has taught for UCSC Extension since 1990.