Beginning Jan. 18, 2022, the Zoo is open Thursdays, Fridays, Saturdays and Sundays from 8 a.m. to 3 p.m. (last admittance 2:30 p.m.). Select animal buildings remain closed. Entry passes are required for all guests, including infants. All visitors ages 2 and older are required to wear a mask in all indoor spaces at the Zoo, regardless of their vaccination status. Fully vaccinated visitors do not need to wear a mask in outdoor areas.

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James Hassell, Ph.D., B.V.M

Keller Family Secretarial Scholar
B.S., B.V.M., M.S., Royal Veterinary College; Ph.D., University of Liverpool

Dr. James Hassell’s research combines ecology and epidemiology to study the connections between environmental change, wildlife and human health. As Skorton Scholar to the Global Health Program, he leads and advances the program's work in Kenya, which looks to combine capacity building with cutting-edge research to mitigate risk at the interface between wildlife, livestock and human health. Through his work with GHP, Dr. Hassell aims to promote the conservation of species and their ecosystems, while protecting human and wildlife health.

Topics he is currently working on include:

  • Population heath and diseases of eastern black rhinoceros
  • The role of wildlife in the emergence of pathogens and antimicrobial resistance in urban settings
  • Toxicology training to mitigate poisoning of African carnivores and vultures
  • The ecology and epidemiology of viral pathogens in bats
  • Wildlife health training programs in East Africa

Dr. Hassell received his Bachelor of Veterinary Science and Medicine from the Royal Veterinary College, before pursuing a master's degree in wild animal health. He completed his doctorate in epidemiology with the University of Liverpool and International Livestock Research Institute, investigating the role of urbanization on the ecology and epidemiology of disease transmission between wildlife, livestock and humans in Nairobi.

Dr. Hassell is an appointed assistant professor adjunct of epidemiology at Yale School of Public Health, and is currently enrolled in a zoological medicine residency with a focus on wildlife population health through the University of Liverpool School of Veterinary Science.

Recent Publications: 

Hassell, J.M., Ward, M.J., Muloi, D., Bettridge, J.M., Robinson, T.P., Kariuki, S., Ogendo, A., Kiiru, J., Imboma, T., Kang'ethe, E.K., Öghren, E.M,, Williams, N.J., Begon, M., Woolhouse, M. E. J. & Fèvre, E.M. 2019. Clinically relevant antimicrobial resistance at the wildlife–livestock–human interface in Nairobi: an epidemiological study. Lancet Planet. Health. 3, e259–e269.

Hassell, J.M., Ward, M.J., Muloi, D., Bettridge, J.M., Phan, H., Robinson, T.P., Ogendo, A., Imboma, T., Kiiru, J., Kariuki, S., Begon, M., Woolhouse, M.E.J. & Fèvre, E.M. 2019. Deterministic processes structure bacterial genetic communities across an urban landscape. Nat. Commun. 10.

Hassell, J. M., Begon, M., Ward, M. J., & Fèvre, E. M. 2017. Urbanization and disease emergence: dynamics at the wildlife–livestock–human interface. Trends in Ecology & Evolution32(1), 55-67.

Hassell, J. M., Zimmerman, D., Cranfield, M. R., Gilardi, K., Mudakikwa, A., Ramer, J. & Lowenstine, L. J. 2017. Morbidity and mortality in infant mountain gorillas (Gorilla beringei beringei): A 46‐year retrospective review. American journal of primatology79(10), e22686.