Introducing Our Team

Accountants and advisors to Silicon Valley since 1979.

Collin Plehiers, CPA

Senior Tax Manager


Business Consulting
Family Office
Small Business Accounting
Tax Authority Examinations
Tax Planning & Return Preparation
Trust & Estates


Professional Services
Real Estate


Certified Public Accountant (CPA)


American Institute of Certified Public Accountants (AICPA)
California Society of Certified Public Accountants (CalCPA)


Bachelor of Science – Business Management, San Jose State University
Certificate of Advanced Accounting Proficiency (CAAP Program), Santa Clara University

“Being spot-on with numbers is a challenge I happily take on for the benefit and peace of mind of our clients.”

I joined Johanson & Yau in 2020 after many years of prior public accounting and tax experience in the Bay Area.

Over the course of my career, I have enjoyed helping clients navigate the intersection between personal finances and taxes, while working closely with businesses of all sizes from startups to larger corporate clients to meet tax filing obligations and stay on track with long-term business goals.

Born and raised in the Bay Area, I live in Redwood City with my girlfriend. We enjoy her 1967 Ford Mustang and chef-level cooking skills. In addition to exploring Skyline and the coastal towns of Pescadero and San Gregorio, we like to travel for out of town weekend escapes or hop on a plane for international destinations.