She is currently leads the Washington Department of Children, Youth, and Families Raised in the Los Angeles suburb of Pacific Palisades, Senn attended Washington University in St. Louis for her undergraduate education.

[3] She went on to attend Columbia University for graduate school, studying public policy and administration.

[4][5] She is a first cousin once-removed of former Washington state Insurance Commissioner Deborah Senn.

[6] Senn was initially selected by the King County Council on September 9, 2013, to replace State Representative Marcie Maxwell and then elected in November 2014 with 63% of the vote.

[10] On December 18, 2024, Senn was appointed by governor-elect Bob Ferguson to lead the Department of Children, Youth, and Families.