Greg Flesch is a guitarist and musician, best known for his work with the rock bands Daniel Amos and The Swirling Eddies (credited as "Gene Pool").

Flesch also works in the Atmospheric Laser Spectroscopy Group at the Jet Propulsion Laboratory in Pasadena, California, writing software for the group's tunable-diode laser spectrometers flown onboard NASA's ER-2 aircraft, balloon, and spacecraft. Flesch also writes software to aid in the reduction, analysis and mining of spectral data.