Harold Rosenberg

Harold William Rosenberg, born on 19 February 1941 in New York City, is an American mathematician who works on differential geometry. He earned his doctorate at the University of California, Berkeley in 1963 under Stephen P. L. Diliberto, and has worked at Columbia University, at the Institut des Hautes Etudes Scientifiques, at the University of Paris and at the IMPA in Brazil. He was elected to the Brazilian Academy of Sciences in 2004. His 1993 work on hypersurfaces in Euclidean space with a constant higher-order mean curvature gave control of the height of such a surface over a plane containing its boundary, with rigidity results for complete surfaces. In 2004 he and Uwe Abresch extended the classical Hopf differential to surfaces in products of a surface of constant curvature with the real line. His students include Norbert A'Campo, Christian Bonatti and Michael Herman.