Louis Welles Shapiro (born 1941)[1] is an American mathematician working in the fields of combinatorics and finite group theory.
[2] Shapiro attended Harvard University for his undergraduate studies and then the University of Maryland, College Park for graduate school.
[3] Shapiro is most known for introducing the Riordan array, named after mathematician John Riordan,[4] 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,[5][6] which has been held annually beginning 2014.
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