Jessica Tierney is a professor and the Thomas R. Brown Distinguished Chair in Integrative Science in the Department of Geosciences at the University of Arizona. Her research studies past climate change with geochemistry and climate models. Studying past climates, including past warm climates and extreme events, can better inform how climate change will affect our planet. Tierney was a Packard Foundation Fellow in Science and Engineering, is a Fellow of the American Geophysical Union, and received the Alan T. Waterman Award from the National Science Foundation, the highest award given to early-career scientists.