Sarah-Marie Belcastro (aka sarah-marie belcastro,[1] born 1970) is an American mathematician and book author. She is an instructor at the Art of Problem Solving Online School[2] and is the director of Bryn Mawr's residential summer program MathILy.[3] Although her doctoral research was in algebraic geometry, she has also worked extensively in topological graph theory.[4] She is known for and has written extensively about mathematical knitting, and has co-edited three books on fiber mathematics.[5] She herself exclusively uses the form "sarah-marie belcastro".[6][1]
Belcastro was born in San Diego, CA in 1970, and grew up mostly in Andover, MA, and in Dubuque, IA.[7] She earned a B.S. (1991) in Mathematics and Astronomy from Haverford College, an M.S. (1993) from The University of Michigan, Ann Arbor, and a Ph.D. (1997) there for a thesis on “Picard Lattices of Families of K3 Surfaces” done with Igor Dolgachev.[8]
Since 2012, she has also been an instructor at the Art of Problem Solving Online School.[2] Since 2013, she has been the director of Bryn Mawr College's residential summer program MathILy (serious Mathematics Infused with Levity).[3] She is also a guest faculty member at Sarah Lawrence College.
She was Associate Editor for The College Mathematics Journal (2003—2019). She has also lectured frequently at the University of Massachusetts, Amherst since 2012.[9][10]