Katie Walder has been cast as the female lead in ABC single camera comedy pilot Square Roots, written and exec produced by Vijal Patel. Michael Fresco (Suburgatory) is directing. Square Roots is about a man from a family of logic-driven engineers who is determined to use his “gift” to help the people he loves with their everyday issues. . .whether they like it or not.

Walder will play Ruth, Dan’s (Adhir Kalyan) wife and mother to their two kids. Ruth is as far from an engineer as you can get and she has a much more normal, non-productive fun approach with the kids. In addition to Kalyan, she joins previously cast Noureen DeWulf, Bernard White and Nina Wadia.

Walder, repped by TalentWorks and Marshak/Mills, has recurred on Mad Men, How I Met Your Mother and New Girl.