Joanna Anthony Ellis-Monaghan is an American mathematician and mathematics educator whose research interests include graph polynomials and topological graph theory. She is a professor of mathematics at the Korteweg-de Vries Institute for Mathematics of the University of Amsterdam.

Ellis-Monaghan grew up in Alaska.^[1] She graduated from Bennington College in 1984 with a double major in mathematics and studio art, and earned a master's degree in mathematics from the University of Vermont in 1986. After beginning a doctoral program at Dartmouth College, she transferred to the University of North Carolina at Chapel Hill, where she completed her Ph.D. in 1995.^[2] Her dissertation, supervised by Jim Stasheff, was A unique, universal graph polynomial and its Hopf algebraic properties, with applications to the Martin polynomial.^[2][3]

She joined the Saint Michael's College faculty in 1992,^[2] chaired the department there,^[1] and has also held positions at the University of Vermont.^[2] In 2020 she became professor of Discrete Mathematics at the University of Amsterdam.^[4]

With Iain Moffat, Ellis-Monaghan is the author of the book Graphs on Surfaces. New York: Springer. 27 June 2013. ISBN 978-1-4614-6970-4. OCLC 859157796..^[5]

From 2010-2020, she served as Editor-in-Chief of PRIMUS, a journal on the teaching of undergraduate mathematics.^[6]