Geffen Mesher & Co., P.C. is a CPA, consulting, and business advisory firm based in Portland, Oregon, with an additional office noted in Vancouver, Washington. The firm traces its work to accounting and consulting since 1933 and describes its focus as supporting the plans and goals of clients, its people, and the broader community.

The firm lists a broad service mix that includes Accounting & Assurance, advisory services, outsourced accounting, taxation planning, State & Local Tax (SALT), estate planning, financial and retirement planning, data and analytics, forensic and integrity services, litigation support, and transaction advisory services. Its site also identifies practice areas for businesses, professional services, high net worth individuals, family offices, and industry-specific clients such as construction, real estate, manufacturing and distribution, agribusiness, medical and dental, and law firms.