Who is the principal investigator for JWST's NIRCam instrument?

Marcia Rieke is the principal investigator for JWST’s NIRCam instrument. She is an astronomer at the University of Arizona and led the scientific and technical effort behind the telescope’s primary near-infrared imaging camera.

NIRCam detects light from roughly 0.6 to 5 micrometers. Because cosmic expansion stretches the light from very distant, early galaxies toward longer wavelengths, infrared imaging is crucial for studying the first generations of galaxies and stars. NIRCam also supports investigations of stellar populations, exoplanets, and dusty regions of star formation.

Rieke’s role was not simply to operate the camera after launch. A principal investigator helps define the instrument’s scientific goals and requirements, oversees its development, and coordinates the team responsible for delivering it. NIRCam was developed by the University of Arizona in partnership with Lockheed Martin’s Advanced Technology Center.

Readers sometimes confuse the principal investigator with the company that built the hardware. Lockheed Martin built the instrument with the University of Arizona team, while Marcia Rieke led the NIRCam effort scientifically. John Mather, by contrast, was JWST’s senior project scientist, not NIRCam’s principal investigator.