Jonna Ann Keener Mazet (born December 18, 1967) is an American veterinarian, epidemiologist and a Distinguished Professor of Epidemiology and Disease Ecology at the University of California, Davis.

UC Davis Grand Challenges focuses on developing climate solutions, preventing and responding to emerging health threats, promoting sustainable food systems, and reimagining the role of land-grant universities.

Recognized for her innovative and holistic approach to emerging environmental and global health threats, she is an elected member of the National Academy of Medicine and a fellow of the American Association for the Advancement of Science.

She joined the faculty of the UC Davis School of Veterinary Medicine in 1998 and became Co-director of the fledgling Wildlife Health Center and moved the headquarters of the OWCN to the university.

[8] Prior to the Grand Challenges initiative, Mazet was Principal Investigator and Global Director of USAID’s PREDICT Project, which worked in more than 30 countries to build capacity to develop surveillance systems and complete the necessary research to halt the next pandemic, like influenza, SARS, Ebola, and HIV.

She also co-authored the following recent publications: The discovery of Bombali virus adds further support for bats as hosts of ebolaviruses (Nature Microbiology) and The Global Virome Project (Science).