Research Professor
Fields of Interest
Biography
My laboratory pioneered the development and application of tools to measure DNA, hormones, and toxicants in wildlife scat, which is the most accessible animal product in nature. We simultaneously trained detection dogs to locate scat samples over large remote areas. These combined tools have provided wildlife managers a physiological window into how multiple concurrent environmental pressures impact wildlife. DNA is used to determine the species, sex and individual identities of wildlife as well as their diets. Hormones from these same samples measure stress, nutritional status, reproductive health and toxicant exposure. The combined tools are now being used by hundreds of investigators worldwide.
On the forensic side, my lab identified the three largest poaching hotspots in Africa by developing methods to extract DNA from tusks recovered from large ivory seizures and comparing that to a comprehensive DNA map of elephant populations we assembled from dung collected across Africa. We also developed tools to link the major Transnational Criminal Organizations (TCOs) driving Africa’s ivory trade to multiple shipments and to each other by genetically matching tusks from the same elephant or close family members found across shipments. We expanded this approach in a collaboration with Microsoft AI for Good, using AI to identify unique signatures handwritten on thousands of tusks by traffickers moving ivory up the supply chain and matching these signatures to tusks in separate shipments. Combining the DNA and handwriting methods enabled us to show that the major TCOs operating in East and West Africa have begun expanding operations into southern Africa, where over half of Africa’s elephants remain. We incorporate these tools into capacity building programs across Africa to empower nationals from multiple countries with state-of-the-art tools to address their conservation and management challenges.
Dr. Wasser acquired his B.Sc in Zoology at Michigan State University, his M.Sc in Zoology at University of Wisconsin-Milwaukee, and his Ph.D. in Animal Behavior at the University of Washington. He was awarded the first H.F. Guggenheim Career Development Award for his studies of reproductive impacts of aggression in female mammals. He then received the first Research Scientist Development Award from the Smithsonian Institution for his work on noninvasive hormone methods. Wasser was awarded the endowed chair in Conservation Biology by the University of Washington Board of Reagents. He is currently Research Professor in the UW Department of Biology and Director of their Center for Conservation Biology after being awarded the endowed chair in Conservation Biology by the University of Washington Board of Reagents.
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Career Development Award, H.F. Guggenheim Foundation, 1984Research Development Award, Smithsonian Institution, 1989Endowed Chair in Conservation Biology, University of Washington, 2001Environmental Leadership Award, Alberta Emerald Foundation, 2014Elephant Hero Award, National Geographic Society, 2015Grand Prize, Wildlife Crime Tech Challenge, USAID, 2016Albert Schweitzer Award for Animal Welfare, Animal Welfare Institute, 2018Trade, Fraud Enforecement Award, Homeland Security Investigations, 2020Lowell Thomas Award for Conservation Genetics, Explorer's Club, 2022
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Selected Research
- Kuhner, MK, KS Gobush, Z Kaliszewska, R Horowitz, SK Wasser. 2025. Distribution of African savanna elephants (Loxodonta africana), African forest elephants (L. Cyclotis), and their hybrids across Africa based on genetic evidence. Global Ecology and Conservation 59:e03530.
- Wasser, SK, CJ Wolock, MK Kuhner, JE Brown, C Morris, RY Horowitz, A Wong, CJ Fernandez, MY Otiende, Y Hoareau, ZA Kaliszewska, E Jeon, BS Weir. 2022. Elephant genotypes reveal the size and connectivity of transnational ivory traffickers. Nature Human Behaviour : 6: 371-382.
- Wasser, SK, A Torkelson, M Winters, Y Horeaux, S Tucker, MY Otiende, FAT Sitam, J Buckleton, BS Weir. 2018, Combating transnational organized crime by linking multiple large ivory seizures to the same dealer Science Advances 4: eaat0625.
- Persistent Organic Pollutant Determination in Killer Whale Scat Samples: Optimization of a Gas Chromatography/Mass Spectrometry Method and Application to Field Samples, Wasser Samuel K, Lundin Jessica I, Dills RL, Ylitalo Gina M, Bradley Hanson M, Emmons Candice K, Schorr GS, Hempelmann Jennifer A, and Parson Kim M, Arch Environ Contam Toxicol , Volume DOI 10.1007/s00244-015-0218-8 (2015)
- Polycyclic aromatic hydrocarbons in caribou, moose, and wolf scat samples from three areas of the Alberta oil sands, Wasser Samuel K, Lundin Jessica I, and Riffell Jefferey A, Environmental Polution, Volume 206, p.527-534 (2015)
- Genetic assignment of large seizures of elephant ivory reveals Africa’s major poaching hotspots., Wasser Samuel K, Mailand Celia, Lisa Brown, Mondol Samrat, Clark William, Laurie Cathy, and Weir Bruce S, Science, 07/2015, Volume 349, p.84-87 (2015)
- Physiological implications of landscape use by free-ranging maned wolves in Brazil, Wasser S K, Vynne CR, and Booth RK, Journal of Mammology, Volume 95, Issue 4 (2014)
- Male biased sex ratio of poached elephants is negatively related to paching intensity, Wasser S K, Mondol S, and Mailand CR, Conservation Genetics, 2014, Volume DOI 10.1007/s10592-04-0603-2 (2014)
- Quantifying past and present connectivity illuminates a rapidly changing landscape for the African elephant, Wasser S K, Epps CW, Keim JL, Mutayoba BK, and Brashares JS, Molecular Ecology, 2013, Volume 22, p.1574-1588 (2013)
- Effects of exposure, diet, and thermoregulation on fecal glucocorticoid measures in wild bears, Wasser S K, Stetz J, Hunt K, and Kendall KC, PLoS One, 2013, Volume 8, Issue 2 (2013)
- Distinguishing the impacts of inadequate prey and vessel traffic on an endangered killer whale population, Wasser S K, Booth RK, Ayres KL, Hempelmann JA, Koski KL, Emmons CK, Baird RW, Balcomb-Bartok K, Hanson HB, and Ford MJ, PLoS One, Volume 7, Issue 6, p.e36842 (2012)
- Evidence that ship noise increase stress in right whales, Wasser S K, Hunt K, Rolland RM, PArks SE, Castellote M, Corkerson PJ, Nowacek DP, and Kruase SD, Proceedings Royal Society B< Biological Sciences, Volume 279, p.2363-2368 (2012)
- Using detection dogs to conduct simultaneously surveys of northern spotted and barred owls, Wasser S K, Booth RK, Hayward LS, Hartman J, Broms K, Berg J, Seely E, Lewis L, and Smih H, PLoS One, Volume 7, Issue 8, p.e42892 (2012)
- Combating the illegal trade in African elephant ivory with DNA forensics, Wasser Samuel K, Clark William Joseph, Drori Ofir, Kisamo Emily Stephen, Mailand Celia, Mutayoba Benezeth, and Stephens Matthew, Conservation Biology, 2008, Volume 22, Issue 4, p. - -1071 (2008)
- Using DNA to track the origin of the largest ivory seizure since the 1989 trade ban, Wasser Samuel K, Mailand Celia, Mutayoba Benezeth, Stephens Matthew, Booth Rebecca, Kisamo Emily, and Clark Bill, Proc Nat Acad Sci, 2007, Volume 104, Issue 10, p. - -4233 (2007)
- Scat detection dogs in wildlife research and management: application to grizzly and black bears in the Yellowhead Ecosystem, Alberta, Canada, Wasser S K, Davenport B, Ramage E R, Hunt K E, Parker M, Clarke C, and Stenhouse G, Canadian Journal Of Zoology-Revue Canadienne De Zoologie, 2004, Volume 82, Issue 3, p. - -492 (2004)
- A generalized fecal glucocorticoid assay for use in a diverse array of nondomestic mammalian and avian species, Hunt Kathleen E, Wasser Samuel K, Millspaugh Joshua J, Brown Janine L, Cooper Kathy, Crockett Carolyn M, Bechert Ursula, Larson Shawn, and Monfort Steven L, General and Comparative Endocrinology, 2000, Volume 120, Issue 3, p. - -275 (2000)
- Noninvasive physiological measures of disturbance in the northern spotted owl, Wasser Samuel K, Bevis Kenneth, King Gina, and Hanson Eric, Conservation Biology, 1997, Volume 11, Issue 4, p. - -1022 (1997)
- Reproductive control in wild baboons measured by fecal steroids, Wasser Samuel K, Biology of Reproduction, 1996, Volume 55, Issue 2, p. - -399 (1996)
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Autumn 2025
Spring 2025
Winter 2025
Autumn 2024
Spring 2024
Winter 2024
Autumn 2023
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Winter 2023
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