Thomas Greene is an astrophysicist at NASA’s Ames Research Center near Mountain View, California. He has also held positions at the Lockheed Martin Advanced Technology Center and at the University of Hawaii Institute for Astronomy. In addition to his work on young stars, he has also done research in developing infrared detectors and various astronomical instruments. In his spare time he bicycles and hikes with his wife Deb and their dog Sputnik. Address: NASA Ames Research Center, MS 245–6, Moffett Field, CA 94035–1000. Internet: tgreene@mail.arc.nasa.gov