Louis Welles Shapiro (born 1941) is an American mathematician working in the fields of

combinatorics Combinatorics is an area of mathematics primarily concerned with counting, both as a means and as an end to obtaining results, and certain properties of finite structures. It is closely related to many other areas of mathematics and has many ...

and

finite group theory In abstract algebra, a finite group is a group whose underlying set is finite. Finite groups often arise when considering symmetry of mathematical or physical objects, when those objects admit just a finite number of structure-preserving tra ...

. He is an emeritus professor at

Howard University Howard University is a private, historically black, federally chartered research university in Washington, D.C., United States. It is classified among "R1: Doctoral Universities – Very high research activity" and accredited by the Mid ...

. Shapiro attended

Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...

for his undergraduate studies and then the

University of Maryland, College Park The University of Maryland, College Park (University of Maryland, UMD, or simply Maryland) is a public university, public Land-grant university, land-grant research university in College Park, Maryland, United States. Founded in 1856, UMD i ...

for graduate school. Shapiro is most known for introducing the Riordan array, named after mathematician John Riordan, and developing the theory around it. He has been an organizer of and speaker at the annual International Conference on Riordan Arrays and Related Topics, which has been held annually beginning 2014.

References

1941 births Living people 20th-century American mathematicians 21st-century American mathematicians Howard University faculty Harvard University alumni University of Maryland, College Park alumni {{US-mathematician-stub