Bachelor of Science in Astronomy from the California Institute of Technology, 1967; Ph.D. in physics from the University of California, San Diego, 1972; Project Assistant, Department of Astronomy, University of Wisconsin-Madison, 1973-1974; Assistant Professor, Department of Astronomy, University of Wisconsin-Madison, 1974-1980; Associate Professor, Department of Astronomy, University of Wisconsin-Madison, 1980-1986; Payload Specialist, NASA/University of Wisconsin-Madison, July 1984 - December 1990; Professor, Washburn Observatory, University of Wisconsin-Madison, 1986-present; Director, Space Astronomy Lab, University of Wisconsin-Madison, 1996-present; served as backup for STS-61E, STS-35.