Linda Zall is an environmental scientist who previously worked for the Central Intelligence Agency. While at the CIA she was responsible for establishing in 1992 a task force named Medea, which specialized in using spy satellite images to produce environmental data.[1][2]

Personal lifeEdit

Zall grew up in North Hornell. Her father was the manager of a large dairy.[1] He later became a professor at Cornell University, retiring as Professor Emeritus (

Zall married and divorced Charles Sheffield, an English-born mathematician, physicist and science fiction writer. The pair had two daughters Elizabeth and Victoria Sheffield.[3][4]


Zall received a PhD in civil and environmental engineering from Cornell University. While at the school, she was mentored by Donald J. Belcher.[1]


Zall worked at the Earth Satellite Corporation From 1975 to 1984 before moving to the CIA in 1985. She retired in 2013.[1]


  1. ^ a b c d Broad, William (5 January 2021). "Inside the C.I.A., She Became a Spy for Planet Earth". New York Times. Retrieved 6 January 2021.{{cite news}}: CS1 maint: url-status (link)
  2. ^ Sanchez, Kate (5 January 2021). "Go read these stories about the use of spy satellite images in environmental studies". The Verge. Retrieved 6 January 2021.{{cite news}}: CS1 maint: url-status (link)
  3. ^ Pace, Eric (9 January 2002). "Charles Sheffield, 67, Physicist And Author of Science Fiction". New York Times. Retrieved 6 January 2020.
  4. ^ Estrada, Louie (3 November 2002). "Charles Sheffield Dies at 67". Washington Post. Retrieved 6 January 2020.

External linksEdit