Our Story

Simborg • Killingsworth is one of the preeminent family law firms in the San Francisco Bay Area offering representation in litigation and mediation as well as private judging services. The partners of the firm—Madeleine Simborg, Sarah Killingsworth, Erin Dominguez and Catherine Kendrick—have 65 years of combined family law experience. Sarah and Madeleine have been partners since 2004. Erin joined the partnership in 2015 and Catherine joined the partnership in 2019.

Our Firm

Our Team


Madeleine Simborg

Madeleine has practiced family law since 1977, originally with Diamond, Bennington & Simborg and then as a solo practitioner before forming Simborg • Killingsworth in January 2004. Madeleine has been a Certified Family Law Specialist since 1983. After 25 years of a traditional family law litigation practice, Madeleine now limits her practice to mediation, private judging, and consultations. Learn More »


SARAH C. Killingsworth

Sarah is a partner at Simborg • Killingsworth and a Certified Specialist in Family Law as certified by the California Board of Legal Specialization. Sarah's family law practice includes collaborative law, mediation, consultations and litigation. Sarah has been practicing family law since 1998. She is an experienced and highly skilled mediator who also excels in client representation, including complex litigation. Learn More »



Erin is a partner at Simborg • Killingsworth. She concentrates her practice exclusively on family law. She represents spouses and domestic partners in family law proceedings involving complex property division, child and spousal support, and custody and visitation. Erin also has extensive experience in parentage actions, domestic violence restraining order proceedings, and pre- and post-marital agreements. Learn More »


Catherine R. Kendrick

Catherine concentrates her practice on complex family law matters involving equity compensation, financial apportionment, fiduciary duties, property characterization, division and allocation, business valuation, spousal and child support, and child custody disputes. Catherine has extensive experience assisting clients through all phases of litigation and through trial both before private judges and in the Bay Area public courthouses. Learn More »