- Along with her sister Crystal, began acting at a young age at her mother's dance studio.
- Her breakthrough role came at age 12 as Winnie Cooper in The Wonder Years; her sister had originally auditioned for the part.
- Graduated summa cum laude from UCLA with a degree in mathematics; co-authored a new math theorem, the Chayes-McKellar-Winn Theorem.
- Wrote, directed and produced the 2001 short Speechless...; the film won Best Short in the 2002 California Independent Film Festival.
- Authored the 2007 book Math Doesn't Suck: How to Survive Middle-School Math Without Losing Your Mind or Breaking a Nail.
- Scott Sveslosky — Husband
- Crystal McKellar — Sister
- Chris McKellar — Father
- Draco Verta — Son
- Mike Verta — Ex-husband
- Mahalia McKellar — Mother
- University of California, Los Angeles, California, United States (BS in Mathematics, 1998)
Season 3, Episode 3
- Birth Name: Danica Mae McKellar
- Birth Place: La Jolla, California, United States
- Birthday: January 3, 1975, Capricorn
- Profession: Actor, Mathematician, Writer, Director, Producer
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