In 2014, Dan Leightman became the principal of Leightman Tax Law PLLC.  Previously he was a partner in the International Tax Group at Gardere in Houston, TX.  Utilizing more than 30 years of experience as an in-house senior corporate tax executive, he handles a broad range of tax matters including foreign tax, mergers and acquisitions, worldwide effective tax rates, income tax, foreign currency issues, tax accounting, taxation of structured financial products and international joint ventures.

Prior to joining Gardere, Mr. Leightman was Vice President-Taxes at Cooper Industries Ltd. and Director of Taxes at Intel Corp. and Parsons Corp. Mr. Leightman is a frequent speaker for numerous tax conferences and seminars sponsored by IFA, Tax Executives Institute, Practicing Law Institute, Internal Revenue Service International - George Washington University, World Trade Institute, CITE, Risk Magazine of London, Financial Times of London and Structured Finance Institute, among others.


  • Tax 
  • Employee Benefits and Executive Compensation 
  • Federal, State and International Tax
  • Mergers and Acquisitions 
  • Energy
  • International Tax and Transfer Pricing 


  • Member, State Bar of Texas
  • Member, American Bar Association
  • Member, Houston Bar Association  - Chair, Senior Lawyers (2011-2012)  - Former Chair, Taxation Section (2008-2009)   - Former Treasurer (2006)  - Former Secretary (2005)
  • Member, Tax Advisory Committee, Council for International Tax Education
  • Member, Board of Directors, Houston International Tax Forum  - Program Director (2012)  - Chairman, Houston Tax Procedure Group
  • Adjunct Professor of Law, University of Houston Law Center:  International Tax Business Planning - Taxation of Financial Products - Tax Accounting
  • Former Member, Tax Executives Institute 
  • Former Member, National Board of Directors
  • Former Member, International Tax Committee
  • Former Program Chair, TEI Houston Chapter
  • Former President, TEI Houston Chapter
  • Former Vice President, TEI Region VIII Founder,
  • TEI Houston Annual Training Seminar
  • Former Member, Tax Council of Manufacturers Alliance
  • Former Member, Internal Revenue Service International Advisory Committee - George Washington University Annual Tax Institute
  • Participant, Harvard Advanced Management Program (1996)


  • LL.M., Boston University School of Law (1968) 
  • LL.B., The University of Texas School of Law (1966)


E. Daniel Leightman