Long Citation
Peter Stetson has developed computer software to facilitate the measurement of the brightness and colours of individual stars in stellar clusters and other areas of the sky in which the recorded images of the stars are crowded together, or overlapping. His software is much in demand and is used by astronomers all over the world. Stetson himself has applied it to the study of the ages of stars in our own Galaxy and in other galaxies and to the determination of the age of the universe from its expansion rate. On all these topics he is considered a leading authority.

Short Citation
Peter Stetson has developed computer software to facilitate the measurement of brightness and colours of individual stars in stellar clusters and other areas of the sky in which the recorded images of the stars are crowded together, or overlapping. The software is in high demand and is used by astronomers world-wide. Stetson himself has applied it to the study of the ages of stars and to the determination of the age of the universe from its expansion rate. On all these topics he is considered a leading authority.