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|Denis L. Rousseau|
|Institutions||Albert Einstein College of Medicine of Yeshiva University|
|Alma mater||Princeton, Bowdoin|
|Doctoral students||Shi Zhong
|Known for||Biophysics using Resonance Raman spectroscopy of hemoproteins|
Denis L. Rousseau (signing papers as D. L. Rousseau) is an American scientist. He is currently Professor and University Chairman of the department of Physiology and Biophysics at Albert Einstein College of Medicine. 
Rousseau is professor and University Chairman of Physiology and Biophysics at the Albert Einstein College of Medicine, of Yeshiva University, a position he has held since 1996. He received his B.A. from Bowdoin College and received his Ph. D. in Physical Chemistry from Princeton University. After holding a position as research associate in the Physics Department at the University of Southern California, studying with Sergio Porto, he joined AT&T Bell Laboratories in 1969.
In the 1970s, he used infrared spectroscopy to demonstrate that what was thought to be a newly discovered form of water, polywater, was structurally similar to human sweat. This result suggested that the novel properties of polywater were due to contamination from biological impurities, and later described the proposal of polywater as an example of Pathological science. He is also a pioneer in using Resonance Raman spectroscopy to study heme proteins, notably hemoglobin, Cytochrome c oxidase, Nitric oxide synthase, and the folding of cytochrome c.