Danica Mae McKellar (born January 3, 1975), is an American actress and mathematical education advocate. She is best known for her role as Winnie Cooper in the television show The Wonder Years, and now as author of the two New York Times bestsellers, "Math Doesn't Suck," and "Kiss My Math" that encourage and empower middle-school girls with mathematics know-how.

Born in La Jolla, California, McKellar moved with her family to Los Angeles, when she was eight. McKellar and sister Crystal McKellar both maintained professional acting careers as kids, but with a strong emphasis on education as a priority. As a result, Crystal became a lawyer, and Danica majored in mathematics in college.