The Leroy P. Steele Prizes are awarded every year by the American Mathematical Society, for distinguished research work and writing in the field of mathematics. Since 1993, there has been a formal division into three categories. The prizes have been given since 1970, from a bequest of Leroy P. Steele, and were set up in honor of George David Birkhoff, William Fogg Osgood and William Caspar Graustein. The way the prizes are awarded was changed in 1976 and 1993, but the initial aim of honoring expository writing as well as research has been retained. The prizes of $5,000 are not given on a strict national basis, but relate to mathematical activity in the USA, and writing in English (originally, or in translation). Steele Prize for Lifetime Achievement 2023 Nicholas M. Katz 2022 Richard P. Stanley 2021 Spencer Bloch 2020 Karen Uhlenbeck 2019 Jeff Cheeger 2018 Jean Bourgain 2017 James G. Arthur 2016 Barry Simon 2015 Victor Kac 2014 Phillip A. Griffiths 2013 Yakov G. Sinai 2012 Ivo M. Babuška 2011 John W. Milnor 2010 William Fulton 2009 Luis Caffarelli 2008 George Lusztig 2007 Henry P. McKean 2006 Frederick W. Gehring, Dennis P. Sullivan 2005 Israel M. Gelfand 2004 Cathleen Synge Morawetz 2003 Ronald Graham, Victor Guillemin 2002 Michael Artin, Elias Stein 2001 Harry Kesten 2000 Isadore M. Singer 1999 Richard V. Kadison 1998 Nathan Jacobson 1997 Ralph S. Phillips 1996 Goro Shimura 1995 John T. Tate 1994 Louis Nirenberg 1993 Eugene B. Dynkin Steele Prize for Mathematical Exposition Steele Prize for Seminal Contribution to Research Leroy P. Steele Prizes awarded prior to 1993 1992 Jacques Dixmier for his books von Neumann Algebras (Algèbres de von Neumann ), Gauthier-Villars, Paris (1957); C*-Algebras (Les C*-Algèbres et leurs Representations ), Gauthier-Villars, Paris (1964); and Enveloping Algebras (Algèbres Enveloppantes ), Gauthier-Villars, Paris (1974). 1992 James Glimm for his paper, Solution in the large for nonlinear hyperbolic systems of conservation laws, Communications on Pure and Applied Mathematics, XVIII (1965), pp. 697–715. 1992: Peter D. Lax for his numerous and fundamental contributions to the theory and applications of linear and nonlinear partial differential equations and functional analysis, for his leadership in the development of computational and applied mathematics, and for his extraordinary impact as a teacher. 1991: Jean-François Treves for Pseudodifferential and Fourier Integral Operators, Volumes 1 and 2 (Plenum Press, 1980). 1991 Eugenio Calabi for his fundamental work on global differential geometry, especially complex differential