Erica Gail Klarreich is an American mathematician, journalist and science popularizer.
Klarreich's father was a professor of mathematics, and her mother was a mathematics teacher.
Klarreich obtained her Ph.D. in mathematics under the guidance of Yair Nathan Minsky at Stony Brook University in 1997.
As a mathematician, Klarreich proved that the boundary of the curve complex is homeomorphic to the space of ending laminations.
As a popular science writer, Klarreich's work has appeared in publications such as Nature, Scientific American, New Scientist, and Quanta Magazine. She is one of the winners of the 2021 Joint Policy Board for Mathematics Communications Award for her popular science writing.
As of 2025, Klarreich lives in Berkeley, California.