With nearly three decades of experience in tax and cross-border transactions and a Big Four accounting background, Phyllis Guillory is uniquely equipped to advise clients on complex tax issues, both at home and abroad. She has helped numerous public and private business entities, trusts, and individuals in a variety of industries, particularly those in the global energy and natural resources sector, navigate the complex tax laws of more than 50 countries.

In addition to counseling clients on launching international businesses, Phyllis advises on local and overseas tax effects, cross-border transactions, personnel issues, choice of business entity, and reorganization of business structures to minimize tax liability. She works with domestic and non-U.S. businesses and investors, assisting them with the peculiarities of the U.S. tax system. Phyllis also works with individuals on a wide range of international investment and pre-immigration tax planning strategies to minimize their future income, estate, and gift tax obligations.

Honors & Awards

  • Recognized in Best Lawyers: Ones to Watch in America, Tax Law, 2024

  • Named to the Houstonia Magazine List of Top Lawyers, International Tax, 2018-2022

  • Selected to the Texas Super Lawyers List of Rising Stars, 2004-2005

Professional Engagement

  • American Bar Association
  • Houston Bar Association


  • “Trends in Structuring Cross-Border Joint Ventures,” Houston TSCPA 2024 Tax Expo

  • “International Tax Planning and the Effect of Current Legislative Proposals,” Houston TSCPA 2022 Tax Expo

  • “Tax Traps & Employment Law Considerations of a Remote Workforce,” Chamberlain Hrdlicka Online Seminar, April 2021

  • “What Every Tax Practitioner Should Know about Cross-Border Taxation,” State Bar of Texas Tax Law in a Day, January 2021

  • “2020 International Tax Update – Where are We Now?” Chamberlain Hrdlicka Annual Tax Planning Seminar, November 2020

  • “Key Aspects of Doing Business Internationally,” Houston Business Journal Panel of Experts, December 12, 2018

  • “Overview of International Provisions of Tax Cuts and Jobs Act,” Chamberlain Hrdlicka Tax Forums 2018

  • “Tax Implications for Intellectual Property Transactions,” Business Development Academy, May 2018

  • “Not Cheap As Dirt: The Tax Implications of Foreign Ownership of Real Property,” Chamberlain Hrdlicka Annual Tax Planning Seminar, November 2017

  • “Roadmap for Dealing with Clients Having International Investments,” Chamberlain Hrdlicka Annual Tax Planning Seminar, November 2016