Associates & Affiliates

Dr. Paul C. Marsh
Owner and PI

Ph.D. 1979, University of Minnesota

Ecology and Conservation of Southwestern Fishes

Dr. Marsh’s research deals broadly with aquatic ecology in the arid southwest, with emphasis on the community of imperiled native fishes of the region (the suite of indigenous taxa occupying a diversity of aquatic habitats in western United States and Mexico). Laboratory investigations supplement a strong field program examining basic life history characteristics and population and community biology. These pursuits go hand-in-hand with applied management in behalf of target species. Activities are strongly collaborative with academia, state and federal resource agencies, non-governmental organizations, and the private sector.

Beverly Ross
General Manager

B.S. Accountancy, National University

Beverly has worked as a contractor for the Native Fish Lab since 2009 and became a full time employee August of 2014. Her love of the outdoors makes her office work easy to be passionate about. She is also the Treasurer of Marsh Education, and dedicated to get Sharing Tails back in Arizona schools.

Brian Kesner
Senior Project Manager

M.S. 2004, James Cook University, Queensland, Australia

Brian is interested in quantitatively assessing the status and trends of ‘big river’ native fish stocks in the Colorado River. His approach uses standard statistical techniques but he also is developing and applying techniques that are unique to the type of data available and the difficulties associated with data for species that are rare and reintroduced. He also likes to get his feet wet occasionally and assists with monitoring programs throughout the Colorado River basin in Arizona and farther a field. Brian has worked with Dr. Marsh and the Native Fish Lab since 1998.

Carol Pacey
Project Manager

M.S. 1996, Texas A&M University

Ms. Pacey has been with the Native Fish Lab since 1998 and plays multiple roles within the organization. She developed and presents statewide the wildly successful “Sharing Tails” educational program that teaches kindergarten and early elementary school children about native Arizona fishes (see the link above and on our home page). She also is responsible for primary maintenance of the lower Colorado River native fishes PIT tag mark and recapture database and analyzes and interprets field data for reports and publications. When not too busy with other duties she assists with field and laboratory work, makes presentations to professional groups, attends meetings, and interacts with M&As myriad cooperators.

Kurtis Shollenberger
Fisheries Scientist

B.S. 2014 Environmental Science, Elizabethtown College, Pennsylvania
M.S. 2019 Fisheries and Aquatic Sciences, Auburn University, Alabama

Kurt joined the Marsh & Associates team in May of 2019 after finishing his master’s program at AU focusing his research on the distribution of the Snail Darter in Northern Alabama using environmental DNA. Kurt enjoys the outdoors and is passionate about the conservation of native species. At M&A, he assists with the monitoring of native fishes in the Gila River Basin and assessing the population status of Razorback Suckers and Bonytail Chub in Lake Mohave and below Palo Verde Dam. When not in the field, Kurt helps with writing technical reports, data analysis, and constructing PIT scanners.

Alex Marini
Fisheries Scientist

B.S. 2021 Environmental Science, Virginia Commonwealth University.

Alex started at the Native Fish Lab in February 2022 after graduating the previous year from Virginia Commonwealth University. Alex enjoys hiking, camping, swimming, and bird watching. At M&A, she assists with the PIT scanning and acoustic telemetry monitoring of native fishes in the Colorado River. When not in the field Alex assists in data entry and analysis, maintaining field equipment, and writing technical reports.

Paul Reap
Fisheries Scientist

B.S. 2022 Conservation Biology and Ecology, Arizona State University

Paul started working at the Native Fish Lab in August 2022. At M&A, Paul assists with PIT scanning and other field work involving native fish species. When he isn’t in the field, he works on data entry, analysis, and writing technical reports. Paul enjoys hunting, fishing, and visiting wild places with his wife and son all around the Southwest.