About Arlene Kostant

Collaborative family lawyer, mediator, and negotiation trainer

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Arlene Kostant is a State Bar Certified Family Law Specialist assisting clients in resolving family law issues through negotiation, mediation and collaboration. She is a Co-Chair of Collaborative Practice San Francisco, and an active participant in and past president of Collaborative Practice East Bay. She is a recipient of the Eureka Award honoring those who have made significant contributions and demonstrated an abiding dedication to establishing and sustaining collaborative practice in California. In addition to her work with collaborative practice groups, Arlene is a member and former chair of the San Francisco Bar Association’s Family Law Section. She has acted as judge pro tem for the San Francisco Family Law court and has an “AV” rating by Martindale-Hubbell. She was selected by the San Francisco Daily Journal as one of California’s 25 most sought-after family law mediators and was named by Law and Politics Publishers as one of the top 50 female lawyers (“Super Lawyers”) in Northern California. Arlene has trained extensively in mediation and collaboration skills, has previously taught mediation and negotiation at Hastings Law School and currently teaches classes in negotiation at UC Berkeley Law. In addition, she leads negotiation workshops for law firms, collaborative practice groups and private industry. Arlene is committed to helping parties stay out of court and to reaching solutions that truly work for them.

bar association status


Admission Details

Admitted in 1977, California

Law School Attended

Golden Gate University, J.D., with honors

Universities Attended

  • New York University, B.A.

  • University of Rochester, Paris, France, M.A.



Associations & Memberships

  • Bar Association of San Francisco (Chair, Executive Committee, Family Law Section, 1997)

  • Contra Costa Bar Association (Member, Family Law Section and ADR Section)

  • State Bar of California (Member, Family Law Section)

  • Collaborative Practice East Bay (Prior President)

  • Collaborative Practice San Francisco (Co-Chair and Executive Board Member)

  • International Academy of Collaborative Professionals


Certified Specialist, Family Law, The State Bar of California Board Of Legal Specialization


As a collaborative law professional, I am committed to helping parties stay out of court and to reaching solutions that truly work for them.

/ arlene Kostant  /



Experienced family law representation and assistance you can trust

When you need experienced, innovative and respectful representation or mediation, please call me at 415-433-2863 or contact me online to schedule an appointment.