Catherine has degrees from both the University of Washington and Saint Martin's College, and has been with Aiken & Sanders since 1980, becoming a partner in 1985. Catherine retired as a partner in 2017 and retired her license in 2022.

She has served as a member of the Grays Harbor Community Hospital Board and as Finance Chairman. Catherine has extensive public accounting experience, specializing in small business accounting, taxation, tax and business consultation. She is a member of the American Institute of C.P.A.'s and the Washington Society of Certified Public Accountants.