Mark Nelkin joined the faculty at Cornell in 1962. His research during the 1960's was primarily in the theory of time correlations in fluids with applications to neutron inelastic scattering from liquids and Brillouin scattering from gases. Since 1971 his primary research interest has been in the theory of fluid turbulence, an area in which he has published many research papers and two review papers.
He spent leaves from Cornell at the University of Paris, The College de France in Paris, The National Bureau of Standards in Gaithersburg, Maryland, Harvard University, and the Courant Institute of Mathematical Sciences at New York University. At the College de France in 1976, he gave a series of twelve lectures on turbulence at the invitation of Pierre Gilles de Gennes. He is a Fellow of the American Physical Society. In 1968, he received a Guggenheim Fellowship.
He retired from Cornell in 1993, and moved to New York City where he continued his research on fluid turbulence. He remains active in refereeing papers for Physical Review Letters, Physical Review E, The Physics of Fluids, and the Journal of Fluid Mechanics. He recently received an award from the American Physical Society as an outstanding referee.