Skip to main content
U.S. flag

An official website of the United States government


Our researchers are based in Bozeman, Montana with field stations at West Glacier and Missoula, Montana and duty stations in Jackson, Wyoming and Knoxville, Tennessee. Scientists from NOROCK work throughout the United States and the world on issues as diverse as global climate change, aquatic ecology, wildlife diseases and genetics, aeroecology, invasive species, and large carnivores. 


Social Media

Employee Directory

Job Title Name Email Phone
Research Fish Biologist Robert Al-Chokhachy, Ph.D. 409-994-7842
Research Ecologist Erik Beever, Ph.D. 406-994-7670
Bureau Approving Official, Ecologist Geneva W. Chong, Ph.D. 703-648-6774
NGP Emergency Response Coordinator Lance Clampitt 406-994-6919
Physical Scientist Adam Clark 406-888-7993
Supervisory Research Ecologist Joseph Clark, Ph.D. 865-974-4790
Biologist Gavin Cotterill, PhD
Research Wildlife Biologist Paul Cross, Ph.D. 406-994-6908
Fisheries Biologist Vin D'Angelo 406-888-7991
Biological Science Technician Chad Dickinson 406-994-5054
Research Ecologist Robb Diehl, Ph.D. 406-994-7481
Research Ecologist Daniel B. Fagre, Ph.D. 406-888-7922
Research Physical Scientist Caitlyn Florentine, Ph.D. 303-548-7693
Research Ecologist Tabitha Graves, Ph.D. 406-589-6645
Research Biologist. Bob Gresswell, Ph.D. 407-994-5304
Biologist Erica Gustilo, PhD
Supervisory Wildlife Biologist Mark Haroldson 406-994-5042
Research Zoologist Blake Hossack, Ph.D. 406-243-4495
Research Statistician Kathi Irvine, Ph.D. 406-994-7492
Biologist Will Janousek, Ph.D. 406-888-7996
Research Wildlife Biologist & Mendenhall Postdoctoral Fellow Aaron Johnston, Ph.D. 406-994-7158
Biologist Bryn Karabensh 406-994-5041
Ecologist Justin T Martin 406-994-5304
Physical Scientist Lisa McKeon 406-253-3223
IT Specialist Kelvin Miller 406-994-7085
Physical Scientist Zachary Miller 406-888-7922
Research Ecologist Clint Muhlfeld, Ph.D. 406-600-9686
Administrative Officer Judy O'Dwyer 406-994-7544
Research Ecologist Greg Pederson, Ph.D. 406-994-7390
Research Physical Scientist Erich Peitzsch, Ph.D 406-599-9970
Physical Scientist Todd Preston 406-994-5034
Center Director Claudia Regan, Ph.D. 406-994-7972
Research Zoologist Adam Sepulveda, Ph.D. 406-994-7975
Administrative Operations Assistant Paula Thomsen 406-994-1977
Supervisory Research Wildlife Biologist Frank T van Manen, Ph.D. 406-994-5043
Partnership Ecologist Sheree J. Watson, PhD 406-994-6556
Biological Science Technician Craig Whitman 406-994-6135
Science Communications Biologist Todd Wojtowicz, Ph.D.