Managing Partner · IRS Enrolled Agent

Derren Hayden Joseph

Chair of the Tax Working Group at Moores Rowland International, admitted to practise before the IRS in all 50 states and internationally, and the author of three books on taxation — one an Amazon Best Seller.

Talk to Derren's team See the press coverage

Comparative Tax Program at Harvard 2 Masters in Economics ACCA Certified Diploma

Derren Hayden Joseph speaking at AmCham Singapore — Speaking at AmCham Singapore

Recognition & media

As Featured In The Press

Top Tax & Accountants Advisory Service in APAC 2026

HTJ.Tax is the cover feature of Financial Services Review, recognised for Building Resilient Global Tax Strategies — with Managing Partner Derren Hayden Joseph on coordinating US tax depth with cross-border execution.

“International tax planning cannot be approached from a single-country perspective. Effective outcomes require qualified professionals in multiple jurisdictions working together.” Derren Hayden Joseph — Managing Partner, HTJ.Tax · Chair, MRI Tax Working Group

ISSN 2835-9771

Also featured in

Singapore Business Review “USA: New Tax Haven”

The principal

About Derren

Education Summary

Comparative Tax Program at Harvard.
I am an EA (Enrolled Agent). As an EA, I have been admitted to practice before the Internal Revenue Service (IRS) to represent taxpayers in all 50 states and internationally.
2 Masters Degrees in Economics and a Certified Diploma from the ACCA (Association of Chartered Certified Accountants in the UK).
Executive Education at Columbia Business School, and Advanced Tax coursework at both New York University and the University of London.

Career Summary

Chair of the Tax Working Group for Moores Rowland International (offices in over 30 countries).
Leadership / Global Committee of the International Business Structuring Association.
Member of the Briefing Group advising The Rt. Hon. The Lord Mayor of the City of London on current and emerging international tax issues.
Board of Advisors of the Caribbean Chamber of Commerce in Europe.
Board of Advisors of an American Social Media company called Vlogmi AI.
Published 3 books on taxation, one of which was an Amazon Best Seller in 2020.
Guest Lecturer – Postgraduate Program in Private Clients at Universidade Católica Portuguesa (more information).

My views have been published in the Bloomberg, the Singapore Business Review, Forbes (Asia), and the American Chamber of Commerce in Indonesia, the International Business Structuring Association (in the UK), Offshore Alert, and the (Trinidad) Guardian. I have delivered seminars in several jurisdictions including the U.S., the U.K., Argentina, Brazil, Uruguay, the Caribbean, France, Spain, Portugal, the UAE, Singapore, Indonesia, Cambodia, Malaysia, Vietnam, Taiwan, the Philippines, Hong Kong and Japan.

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