Dennis M. DeTurck (born July 15, 1954) is an American mathematician known for his work in partial differential equations and Riemannian geometry, in particular contributions to the theory of the Ricci flow and the prescribed Ricci curvature problem. He first used the DeTurck trick to give an alternative proof of the short time existence of the Ricci flow and has found other uses since then.
He received an M.A. (1978) and Ph.D. (1980) in mathematics from the University of Pennsylvania. His Ph.D. supervisor was Jerry Kazdan.
He is currently Evan C Thompson Professor for Excellence in Teaching at the University of Pennsylvania, where he has been the Dean of the College of Arts and Sciences since 2004. In 2002 DeTurck won the Haimo Award from the Mathematical Association of America for his teaching.[1] Despite being recognized for excellence in teaching, he has been criticized for his belief that fractions are "as obsolete as roman numerals" and suggesting that they not be taught to younger students.[2]