B.A., Physics, UC Berkeley, 1967
Ph.D., Astronomy, Harvard University, 1971
I have worked on the astrophysics of cold, low density environments.
Now my major current interest is extrasolar planetary systems: their comets, asteroids, and planets. My long term goal is to determine if there is life in these environments.
My team has played a major role in using white dwarfs to study extrasolar minor planets, and we have demonstrated that we can successfully combine observations obtained at many different wavelengths with theoretical models.