Carroll Alley

Carroll Overton Alley, Jr. (June 13, 1927 – February 24, 2016) was an American physicist. He served as the Principal Investigator on the Apollo Program's Lunar Laser Ranging Experiment, which significantly restricted the possible range of spatial variation of the strength of the gravitational interaction. Alley was a PhD student of Robert Henry Dicke.

Alley’s goal was to understand quantum mechanics, gravitation, and relativity. His lifelong research interests included experimental and theoretical questions about the foundations of gravitational and quantum physics.

Alley developed some of the earliest important laboratory tests of Albert Einstein's theories of relativity. In recent years he became known for alternative theories of gravitation. He was a Physics professor at University of Maryland, College Park, emeritus since 2008, until his death on 24 February 2016.