Patuxent Wildlife Research Center


Northeast Amphibian Research and Monitoring Initiative

Research Team

Evan Grant

Evan Grant

Evan H. Campbell Grant, USGS Patuxent Wildlife Research Center, Research Wildlife Biologist. Evan began working with the NE ARMI research team in March of 2003, just in time for the breeding migration of the spotted salamanders and the beginning of the field season.  He received his PhD in Marine, Estuarine and Environmental Sciences from the University of Maryland, College Park.  His research focuses on the movement ecology of stream amphibians, but he has other interests in ecology at larger spatial scales.

Contact Evan:413-863-2462

Adrianne Brand

Adrianne Brand

Adrianne Brand, USGS Patuxent Wildlife Research Center, Wildlife Biologist. Adrianne joined the NE ARMI research team in May of 2009.  She received her MS in Biology at Towson University in 2008 after completing research on stormwater ponds as breeding habitats for suburban amphibian populations. Adrianne's responsibilities include data collection during the field season, database management, and writing research reports and publications.

Contact Adrianne:413-863-2483

Andrew Dietrich

Andrew Dietrich

Andrew Dietrich, USGS Patuxent Wildlife Research Center, Biological Science Technician. Andrew (re)joined the NE ARMI team in September of 2012. Andrew received his MS in Environmental Science and Management from Portland State University in 2012. His Master’s thesis investigated stream-associated amphibians in the urbanized riparian systems of the Portland, Oregon metropolitan region under the guidance of Dr. Alan Yeakley. Andrew’s responsibilities include data collection during the field season, assisting with the management of the NE ARMI database and preparing research reports.

Contact Andrew: 301-497-5842 email:

Will Fields

Will Fields

Will Fields, USGS Patuxent Wildlife Research Center, Postdoctoral Research Associate. Will joined the NE ARMI Research Team in 2012, and he is currently involved in research examining the effects of stream network structure on salamander populations in the mountains of Virginia. He completed his PhD in Zoology at North Carolina State University, where his dissertation research focused on evaluating the effects of climate change on salamander demography, comparing the relative contributions of amphibian breeding and dispersal habitat to landscape connectivity, testing habitat models for a rare salamander across its range, and testing assumptions about landscape connectivity with experiments on amphibian movement behavior.

Contact Will:

Viviana Ruiz

Viviana Ruiz

My research interests span across the fields of population ecology and conservation biology. I got my BS in Tropical Biology in 2002, and my PhD in Ecology and Evolutionary Biology in 2009. My dissertation work was focused on looking at the responses of tropical bird populations to habitat fragmentation, by applying both capture-mark-recapture and occupancy models. For my postdoctoral research, I have been working on designing sampling guidelines to help increase our knowledge on the demography of tropical birds. In addition, I worked on estimating overwintering dynamics of Neotropical migratory birds in Central America. I recently started a new postdoctoral position with Dr. Evan Grant and Dr. Mevin Hooten (USGS Coop Unit, Colorado State University). Our project focuses on developing calling anuran spatial occupancy models for the Northeastern US, to interpret the role of National Wildlife Refuges in amphibian conservation.

Contact Viviana:

Amber Wiewel

Amber Wiewel

Amber Wiewel, USGS Patuxent Wildlife Research Center, Database Technician. Amber began working with the NE ARMI research team in May of 2011. She received her MS in Ecology and Evolutionary Biology from Iowa State University in 2011. Amber’s responsibilities include data collection during the field season, data management, and contributing to reports.

Contact Amber:

Dan Hocking

Daniel Hocking

Daniel Hocking, USGS Conte Anadromous Fish Research Center, Research Ecologist. Dan joined the NE ARMI Research Team in 2014. Dan received his PhD in Natural Resources and Environmental Science from the University of New Hampshire in 2012. He is currently involved in modeling the abundance and distribution of fish and salamanders in headwater streams in response to land-use and climate. His models are being used in a structured decision making process to improve landscape conservation decisions. He is also working on stream temperature modeling and integrating data and results into web applications for natural resource managers.

Contact Dan:

Rachel Katz

Rachel Katz

Rachel Katz is Postdoctoral Research Associate with the USGS Massachusetts Cooperative Fish and Wildlife Research Unit at the University of Massachusetts-Amherst. Rachel is currently working with researchers and natural resource managers to develop a structured-decision making framework for the conservation of headwater stream species (e.g., native trout and stream salamanders) threatened by climate and land use change within the northeastern US. This project serves as a model for effective landscape-scale collaborative conservation and aims to evaluate adaptive capacity of institutions to manage threats associated with climate change. She received her PhD in Ecology from the Odum School of Ecology at the University of Georgia in 2014. Rachel's broader research interests include developing flow-ecology relationships to better understand population dynamics and persistence of aquatic species.

Contact Rachel:

Sean Sterrett

Sean Sterrett

Sean Sterrett, USGS Patuxent Research Center, Postdoctoral Research Associate. Sean joined the NE ARMI research team in 2014 and will be focusing on a collaborative project aimed at using regional citizen science data to answer questions related to climate change effects on red back salamander ecology at multiple scales. Sean has a general background in amphibian and reptile ecology and completed his M.S. and Ph.D. in Wildlife Ecology and Management from the University of Georgia studying influences of riparian land use on river turtle communities and nutrient dynamics of freshwater turtles. Sean’s general research interests include the effects of human alterations on amphibians and reptiles, vertebrate influences on ecosystems and natural history.

Contact Sean:

Tasha Foreman

Tasha Foreman

Tasha Foreman, USGS Patuxent Wildlife Research Center, Wildlife Biologist. Tasha joined the NE ARMI research team in May of 2013 as a Field Technician and currently acts as the Assistant National Coordinator for its North American Amphibian Monitoring Program (NAAMP), a citizen science powered research effort focused on tracking the long-term site occupancy of frogs and toads in the eastern half of the United States. Tasha received her BS in Natural Resource Ecology and Management at Oklahoma State University in 2008 and her MS in Biology at Howard University in 2013 under the guidance of Dr. George Middendorf III. Her thesis was a case study focused on determining the successional status of a restored forested wetland in Maryland by comparing the initial post-restoration herpetofaunal community and habitat types to those found 15 years later. Tasha’s NAAMP responsibilities include coordination of state partners, public correspondence, database management, data collection, and preparation of research reports and publications.

Contact Tasha: 301-497-5693

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Past Team Members

Robin Jung Brown, Coordinator

Larissa Bailey, Coordinator

Ruscena Wiederholt, Postdoctoral Research Associate

Elise Zipkin, Postdoctoral Research Associate

Priya Nanjappa, Biological Science Technician

Sandra Mattfeldt, Biological Science Technician

Eric Dallalio, Biological Science Technician

Lindsay Funk, Field Technician

Isaac Chellman, Field Technician

Andy Maskell, Field Technician

Bill House, Field Technician

T. Lynette Plenderleith, Field Technician

Clint Otto, Field Technician

Kristen Cecala, Field Technician

Matthew Stover, Field Technician

Moses Michelson, Field Technician

Michelle Weaver, Field Technician

Elizabeth Straus, Field Technician

Lisa Wilson, Field Technician

Derek Bozzell, Field Technician

Andrew Bennett, Field Technician

Addison Reid, Field Technician

Lacy Rucker, Field Technician

Kathleen McCarthy, Field Technician

Stephen Nelson, Field Technician

Christina Hoh, Lab Technician

Tom Maigret, Field Technician

Kevin Oxenrider, Field Technician

Leslie Brinkman, Field Technician

Samantha Collins, Field Technician

Victoria Chaney, Field Technician

Anna Deyle, Field Technician

Kasey Ewing, Field Technician

Elise Edwards, Field Technician

Nathan Cullen, Field Technician

Garrett Sisson, Lab Technician

Kathleen Mahoney, Field Technician

Leah Nagel, Field Technician

(Stephen)Tyler Williams, Field Technician

Sarah-Jane Gerstman, Field Technician

Sarah McGrath, Field Technician

Leah Werner, Field Technician

Tasha Foreman, Field Technician

Jessica Hessong, Field Technician

Emily Foden, Field Technician

Marylou Moore, Field Technician

Anna Ormiston, Field Technician

Joseph Barron, Field Technician

Eric Teitsworth, Field Technician

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