Richard Stanley is the world's leader in algebraic and enumerative combinatorics. He has written over 140 scientific papers, with more than 40 co-authors, and has supervised 44 PhD students. His two volume book "Enumerative Combinatorics" (1986 and 1999) is the definitive work on the subject, and has had an immense influence on today's combinatorialists. His strong vision of the interaction between algebra and combinatorics has been central to much of recent developments in algebraic combinatorics. He has done this through his superb ability to create new topics for study in their own right, and indeed he has pioneered the applications of commutative algebra, algebraic geometry, algebraic topology, Lie algebra, and group representations to combinatorial problems. This has led to mathematical theorems of fundamental importance, and because of his uncanny insight, to deep conjectures in these areas.