Kenneth Walters made a number of significant contributions to rheology and the development of rheological science in the United Kingdom, and has conducted extensive studies of the behaviour of non-Newtonian fluids, particularly elastic liquids. He made important advances in two major areas: the measurement of rheological properties, and the numerical solution of complex flows. In the first area, he extended the theory of viscometric flows, carried out a searching analysis of sources of error in the principal instruments in current use, and maintained a strong commitment to industrial applications arising in the manufacture of lubricants, detergents and paints. His book, Rheometry, is a standard work of reference. He was one of the main pioneers of the application of numerical methods to the rheology of liquids and the book Numerical Simulation of Non-Newtonian Flow, of which he was joint author, is an influential text in a rapidly evolving field of research.

Professor Kenneth Walters FRS died on 28 March 2022.