David Cohen is an Associate Professor of Astronomy in the Department of Physics and Astronomy at Swarthmore College in Swarthmore, Pennsylvania. Professor Cohen specializes in stellar astrophysics, but he also works in the fields of fusion science and laboratory astrophysics. The common themes of his research are the interactions of intense radiation with matter, x-ray spectroscopy, and atomic, hydrodynamics, and spectral modeling of radiation-dominated plasmas. His main research focus is currently the problem of x-ray production in massive stars, which was also the subject of his Ph.D. dissertation at the University of Wisconsin, Madison. Prior to his graduate work at Wisconsin, David studied American history at Harvard College, where he became interested in the historical aspects of astronomy and changed his major to astronomy after discovering that he liked doing calculus problem sets better than writing history papers. He wrote an undergraduate honors thesis on binary stars, under the direction of David Latham. At Swarthmore College, where he has worked for the past six years, David pursues his research interests with his students, as well as some departmental colleagues, including Professor Eric Jensen, who was a graduate school classmate and works on x-ray emission from young stars in collaboration with David. Five students have written honors theses under David's direction at Swarthmore, and many more have worked on research projects with him. These students are now in graduate school (at Cal Tech, Virginia, and Columbia for astronomy, and the Pratt Institute for library science), working in industry as physicists, teaching high school, engaged in political activism, teaching English in Japan, and working in the field of public health. David's teaching at Swarthmore usually includes introductory astronomy for non-majors, introductory astrophysics for majors, and advanced seminars on stellar astrophysics and on the interstellar medium. David is married to the novelist Rachel Pastan (www.rachelpastan.com). They have two daughters: Bess, age 8, and Anna, age 11. More information about David's research, teaching, and public outreach activities can be found at astro.swarthmore.edu/~cohen, including a listing of recently published papers and further information about his student research group.