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What Sets Us Apart Learn About Our Services

MHTB Accountancy Group of Silicon Valley is a highly respected and recognized accountancy firm, founded on the core principals that clients deserve the utmost in professional expertise and service. Launched in 1971 by Bruce McCahan and later joined by Charles Helfrick, Ray Thiercof and James Butera, MHTB has earned a level of trust and confidence with individuals, professionals, medical, real estate, technology, retail and wholesale clientele — providing a wide range of proactive, accurate, and timely financial solutions.

As Silicon Valley has grown, the MHTB team of professionals has evolved under the direction of principal partners James Butera, Angelo Pezzoni, Marcia Nuñez and Michael Shumway, supported by the firm’s committed group of associates and staff. MHTB’s hallmark tradition of friendliness and approachability is coupled with knowledgeable fiduciary advice and counsel; litigation support services; and the comprehensive assessment and preparation of returns and financials — providing clients with a level of expertise, accessibility and responsiveness, rivaling its competitors at all levels.

MHTB takes the time to understand its clients’ financial goals by proactively tailoring its services to fit their specific needs. As a result, they’re better equipped to meet their objectives confidently, successfully and with peace of mind.

  • MHTB consistently ranks in the San Jose/Silicon Valley Business Journal's annual evaluation of the Top 25 Accounting Firms.
  • Money Magazine has recognized MHTB as "One of the best tax practitioners in the nation".
  • The firm is also recognized locally as expert witnesses in the Santa Clara County Superior Courts and as speakers and contributors at educational functions and community events.
  • Member of CalCPA — California Society of Certified Public Accountants and  AICPA — American Institute of Certified Public Accountants.


As a member of the American Institute of Certified Public Accountants, we are subject to independent peer review every three years. We are pleased to share with you the exemplary results of our most recent AICPA Peer Review Examination. We received an unmodified review with no letter of comments, which is the best a firm can receive! The results indicate that our firm maintains "a dedication to excellence and quality and upholds the high standards of our profession".

Please feel free to read the results of our AICPA Peer Review by clicking here to download in PDF format. 

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