Current Staff and Students

Margaret Zimmer
Associate Professor
Department of Soil and Environmental Science
University of Wisconsin, Madison
Adjunct Associate Professor
Department of Earth and Planetary Sciences
University of California, Santa Cruz
Ph.D., Earth and Ocean Sciences, Duke University
M.S., Earth Sciences, Syracuse University
B.A., Environmental Studies, Oberlin College
margaret . zimmer @ wisc.edu
Margaret Zimmer’s research interests include streamflow generation processes, changing winter hydroclimate conditions on water budget components, agricultural water quality, critical zone hydrology.
Awards: 2024 American Geophysical Union Early Career Award (Hydrology Section); 2023 Geological Society of American Early Career Award (Hydrogeology Section), 2021-2026 NSF CAREER Award (Hydrologic Sciences)

Zhaozhe Chen
Postdoctoral Research Associate
Department of Soil and Environmental Science
University of Wisconsin, Madison
Ph.D. Earth Sciences, The Ohio State University
M.Sc. Biochemistry, Stevens Institute of Technology
zhaozhe . chen @ wisc . edu
Zhaozhe Chen’s research interests include evapotranspiration dynamics, land-atmosphere coupling, and the application of bioremediation technologies to improve water quality. His current work explores how critical zone structure mediates ecosystem responses to hydroclimatic variability.

Maggie Phillips
MS Student
Freshwater and Marine Sciences Program
University of Wisconsin, Madison
B.S. Environmental Science, University of New Hampshire
mtphillips3 @ wisc . edu
Maggie worked as a Hydrologist at the US Geological Survey for six years prior to starting at UW Madison. Her research interests include watershed hydrology, biogeochemistry, and groundwater/surface water interactions.

Nerissa Barling
PhD Candidate
Department of Earth and Planetary Sciences
University of California, Santa Cruz
B.S. Geology, Colorado College
nbarling @ ucsc . edu
Nerissa is building her scientific toolkit to investigate how the physical structure of the subsurface controls water storage, plant-water supply, and streamflow generation. She hopes to apply her scientific knowledge of hydrologic systems toward meaningful actions that benefit local community members and ecosystem management. She is co-advised by Dr. Andy Fisher at UC Santa Cruz.

Adam Haynes
PhD Candidate
Department of Earth and Planetary Sciences
University of California, Santa Cruz
M.S. Natural Resources, University of Connecticut
B.S. Natural Resources, Michigan State University
ahaynes1 @ ucsc . edu
Adam Haynes’s research interests include human impacts on aquatic ecosystems and hydro-biogeochemistry; surface water/groundwater exchange processes and modeling; the transport/fate of toxins and other pollutants between terrestrial and aquatic ecosystems; watershed and stream restoration. He is co-advised by Dr. Andy Fisher at UC Santa Cruz.

Sam Motz
PhD Student
Department of Earth and Planetary Sciences
University of California, Santa Cruz
B.S. Earth & Atmospheric Sciences, Georgia Institute of Technology
smotz @ ucsc . edu
Sam Motz’s research interests include watershed hydrology, geomorphology, streamflow generation, and natural hazards. Currently, her research involves using transit time distribution modeling to examine streamflow generation and water storage in two adjacent non-perennial catchments. She is co-advised by Dr. Noah Finnegan at UC Santa Cruz.
Previous Postdoctoral Researchers, Graduate Students, and Lab Managers
Lauren Giggy (PhD; 2025) – Now Geologist at Sespe
Levi Robbins (MS; 2025)
Amanda Donaldson (PhD; 2024) – Now Postdoctoral Research Associate at University of Texas, Austin
Russell Callahan (Postdoctoral Scholar; 2022-2023) – Now Assistant Professor at University of Connecticut
Michael Wilshire (Lab Manager; 2021-2024) – Now graduate student at Portland State University
Maya Montalvo (MS; 2022) – Now Hydrologist at Balance Hydrologic
Emilio Grande (PhD; 2022) – Now Assistant Professor at California State University, East Bay
Peter Willits (Lab Manager; 2019-2021)
Andria Greene (MS; 2020)
Jonathan Swanson (MS; 2020)
Maia Hoffman (Lab Manager; 2018-2019)
Previous Undergraduate Researchers
Melinda Martinez (2023)
Loren Tolley-Mann (2020)
Chris Causbrook (2020)
Zev Fellenbaum (2019)
Noah Lyman (2019)