Cal/EPA was created by Governor Pete Wilson by Executive Order W-5-91 in 1991, following on a "Big Green" initiative Wilson proposed during the 1990 state gubernatorial elections, promising a cabinet-level agency to oversee state environmental regulations and research.
He then held joint appointments at the California Environmental Protection Agency (under the direction of Dr. Lauren Zeise) and the Lawrence Berkeley National Laboratory (in the group of Dr. Joan Daisey).
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During a joint appointment at the California Environmental Protection Agency and at the Lawrence Berkeley National Laboratory he developed, in collaboration with Andrew Gelman, the application of Bayesian numerical approaches to multilevel PBPK models.