Stephen Leisz has a Ph.D. in Geography from the University of Copenhagen and an M.S. in Environmental Monitoring from the Nelson Institute for Environmental Studies at the University of Wisconsin-Madison. Since the early 1990s he has been using remotely sensed data (such as current and historical satellite imagery, aerial photographs, lidar and radar) combined with fieldwork and spatial modeling to investigate the human-environment interactions that lead to land-use and ultimately land-cover changes over local and regional landscapes. In 2010 he started working with Archaeology Professor Chris Fisher to apply remote sensing to archaeology. Their first project together used ALOS PRISM data and lidar data to create digital elevation models in support of archaeological fieldwork and to map pre-Hispanic settlements in the Patzcuaro Basin of Mexico. This work led to further collaborations and the development of the ideas behind the Earth Archive. His work appears in The Proceedings of the National Academy of Sciences, Remote Sensing, PLoS One, Quaternary International, and The International Journal of Remote Sensing.