• Sister of Crystal McKellar.
• Graduated summa cum laude from UCLA with a BA in mathematics in June 1998.
• Is very close to her "The Wonder Years" (1988) co-star Fred Savage.
• Had a 1998 paper published in Britain's "Journal of Physics A: Mathematics & General" with UCLA professor Lincoln Chayes and student Brandy Winn which provided a mathematical proof for a theorem dealing with magnetism in two dimensions. Her Erdos number is at most 4 (her Bacon number, by comparison, is 2).
• Is fluent in French.
• Was a member of the Alpha Chi chapter of Alpha Delta Pi sorority at UCLA
• Attended Jason Marsden's nuptials, October 2004.
• She is of Scottish and Portuguese descent
• Celebrity Judge for UCLA Spring Sing 2005

Danica McKellar, is an American actress better known for her job as Winnie Cooper in the television show, The Wonder Years.

Born in San Diego, California, McKellar and sister Crystal McKellar have mantained a friendly competition to see who gets more acting jobs, and, as a matter of a fact, when the actress who would play Winnie had to be chosen, the only two actresses who were still in competition were the McKellar sisters.

Danica and her family moved to Los Angeles when she was 8, and soon after, she and her sister began acting.

McKellar studied at UCLA, majoring in mathematics, and graduated summa cum laude in 1998. She coauthored a scientific paper1 which appeared in a peer-reviewed physics journal.

Since then, as well as several guest roles in television series, she has written and directed two short films. She has returned to regular television with a role in The West Wing.