Elizabeth Hahnemann Cuthill (October 16, 1923 – January 11, 2011)[1] was an American applied mathematician and numerical analyst known for her work on sparse matrix algorithms, on block iterative methods for the numerical approximation of differential equations, and on the development of computer simulations of nuclear reactors. She was a researcher for the United States Navy at the David Taylor Model Basin.[2] The Cuthill–McKee algorithm and reverse Cuthill–McKee algorithm are heuristics for permuting matrices into forms with small bandwidth and for associated problems in graph bandwidth, named for the work of Cuthill with James McKee.[3][C]