About This Office
Koss Firm APC is a law firm in Walnut Creek, California. Public California State Bar records list 2 attorney profiles using this office address. The associated attorneys are Adam Michael Koss and Catherine Elizabeth Koss. 2 of these profiles list an active license. Their recorded admission year is 2006. Profiles linked to this address self-report practice areas including Professional Liability, Litigation, Trusts & Estates, and Wills & Probate. The State Bar reports certified specialties among these profiles in Legal Malpractice Law (State Bar of California). These profiles report California Lawyers Association membership in Trusts & Estates.
Practice Areas Reported by Attorneys at This Office
These areas come from individual attorney profiles and may not describe every service offered by the firm.
Client Reviews
California attorney registration
Record matched to the official California attorney registry
Bar #245465 · Admitted 2006
Bar #244857 · Admitted 2006
Last verified September 10, 2026.
Source: California public attorney records. No affiliation or endorsement.

