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Lee W. Hartmann  is an American scientist. His work has included advances in our understanding of FU Orionis objects, jets, protostars, T Tauri stars, and other aspects of the formation and evolution of low mass stars like the Sun.

Career
Hartmann received a B.S. in astronomy from Case Western Reserve University in 1978 and a Ph. D. in astronomy from the University of Wisconsin in 1976. His doctoral dissertation is entitled Abundance Analyses of Late-type Dwarfs. After postdoctoral work at the Harvard-Smithsonian Center for Astrophysics, including a CfA Fellowship, he joined the scientific staff at the Smithsonian Astrophysical Observatory. In 2005, he became the Leo Goldberg Collegiate Professor of Astronomy at the University of Michigan.

Hartmann is a Fellow of the AAAS. He is a past Vice President of the American Astronomical Society.

Scientific Accomplishments
Hartmann's book "Accretion Processes in Star Formation" is a marvelous introduction to our current knowledge of star formation. With close interweaving of observations and theory, this much-needed book begins with the contraction phase of an interstellar cloud and concludes with the onset of fusion reactions within the star. The compelling text lucidly describes physical principles and includes many numerical examples derived analytically or semi-analytically from basic principles. For planetary scientists, chapters on molecular clouds and protostellar collapse provide a context for understanding the birth of the Sun.

Hartmann is known for the breadth of his observational and theoretical work on the formation of young, low mass stars. His advances include accretion disk models to explain the evolution of FU Orionis objects and T Tauri stars, flared disk models for the broadband images and infrared excesses of T Tauri stars , , radiative transfer calculations for the spectra of protostars , and