time in Copenhagen. In Germany, Nemenyi belonged to a Socialist party called the ISK, which believed that truth could be arrived at through neo-Kantian Socratic principles. He was an animal-rights supporter and refused to wear anything made of wool. In 1930, Nemenyi entrusted his 3 year old first son, Peter Nemenyi, to be looked after by the socialist vegetarian community, visiting him once a year. He arrived in the US at the outbreak of World War II. He briefly held a number of teaching positions in succession and took part in hydraulic research at the State University of Iowa. In 1941 he was appointed instructor at the University of Colorado (other sources claim Colorado State University), and in 1944 at the State College of Washington. Theodore von Kármán wrote of Nemenyi: "When he came to this country, he went to scientific meetings in an open shirt without a tie and was very much disappointed as I advised him to dress as anyone else. He told me that he thought this was a country of freedom, and the man is only judged according to his internal values and not his external appearance." In 1947 Nemenyi was appointed a physicist with the Naval Ordnance Laboratory, White Oak, Maryland. He was head of the Theoretical Mechanics Section at the laboratory and one of the country's principal authorities on elasticity and fluid dynamics. At the US Navy Research Laboratory, Nemenyi became mentor to Jerald Ericksen, where he put Ericksen to work on the study of water bells. Nemenyi pioneered what he called the inverse or semi-inverse approach, which applied vector field analysis, to obtain numerous exact solutions of the nonlinear equations of gas dynamics, many of them representing rotational flows of nonuniform total energy. In continuum mechanics, "Nemenyi's theorem" proves that, given any net of isothermal curves, there exists a five parameter family of plane stress systems for which these curves are stress trajectories. In his exposition, The Main Concepts and Ideas of Fluid Dynamics in their Historical Development, Nemenyi was highly critical of Isaac Newton's inadequate understanding of fluid dynamics. I. Bernard Cohen argues that Nemenyi pays insufficient attention to Newton's empirical experiments. However, Cohen notes that Nemenyi provides the "most thorough and incisive analyses in print of Newton's work on fluids, written by an obvious master of science. For example, Nemenyi is the only author I have encountered who has shown the