Mark M. Hrenya's Profile Image

Mark M. Hrenya

Phone: (720) 937-4512

Mark Hrenya advises clients on domestic and international tax matters. His clients include software, e-commerce, semi-conductor, biotechnology and pharmaceutical companies; manufacturers and service providers; venture capital and other private equity funds; foreign investors in U.S. real estate; and highly-compensated individuals.

Mark's transactional practice includes domestic and cross-border mergers and acquisitions, joint ventures, partnerships and collaborations, financing transactions (debt and equity) for funds and portfolio companies, and executive transfers. His planning practice includes tax planning for the establishment and reorganizations of international operations, technology transfers, cost-sharing arrangements, fund formations, fund investments, executive and employee compensation, and benefit agreements. Mark also represents companies and individuals on tax controversy matters related to the above matters.

Mark began his career with one of the Big Four accounting firms (PwC), where he worked for seven years in the firm's Denver, San Francisco, and Palo Alto offices before joining a large Denver-based law firm (Holme Roberts & Owen LLP, now Bryan Cave), attending law school, and becoming a partner and co-chair of the firm's international practice for 10 years. Thereafter, Mark was a tax partner for 16 years at a large California based law firm (Cooley LLP) before co-founding Hrenya Senatore LLP in October 2017.

Mark is recognized by his peers in The Best Lawyers in America®: Tax Law and Who's Who Legal: Telecommunications, Media and Technology. He frequently writes and speaks on international tax matters and teaches tax law as an adjunct professor at the University of Denver Sturm College of Law.


  • University of Denver Sturm College of Law
  • Kent State University
    B.B.A. in Accounting and Economics

Bar Admissions

  • Colorado Supreme Court

Professional Associations

  • Colorado Bar Association
  • American Bar Association
  • International Fiscal Association

Honors and Recognition

  • Recognized in The Best Lawyers in America: Tax Law
  • Recognized in Who's Who Legal: Telecommunications, Media and Technology

Prior Professional Experience

  • Cooley LLP
    Tax Partner, 2001-2017
  • Holme Roberts & Owen LLP
    Tax Partner, 1991-2001
  • PwC

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