About John

John Eckweiler is the partner-in-charge of Tax & Business Services for the California region and the national practice leader of the Tax Controversy group. He is also a member of the Firm’s Manufacturing, Retail and Distribution Practice as well as its Construction Services group.

John has more than 25 years of accounting and business advisory experience working with corporate, individual, non-profit, and partnership tax entities. His background also includes a stint with the Internal Revenue Service as a revenue agent.

John’s prior experience has made him an invaluable resource for closely-held companies and high-net-worth individuals. This expertise has allowed him to successfully represent many clients before several federal, state, and local taxing authorities. In addition, it has granted him the opportunity to contribute to many industry publications including the AICPA’s publication – The Tax Adviser.

Marcum's 2023 National Construction Survey

Professional & Civic Affiliations

  • Certified Public Accountant (licensed in California)
  • American Institute of Certified Public Accountants (AICPA)
  • California Society of Certified Public Accountants (CalCPA)

Practice Focus

Corporate, Individual, Nonprofit and Partnership Taxation
Tax Planning, Consulting and Compliance
IRS Representation
Mergers & Acquisitions

Industry Focus

Manufacturing & Distribution
Real Estate
High-Net-Worth Individuals


Bachelor of Science Degree in Business Administration and Accounting
California State University, Long Beach