Person Photo
Person Photo

Colin J.A. Oldberg


555 17th Street, Suite 3200, Denver, CO 80202

Colin focuses his practice on state and local taxation, federal tax controversy, federal and state income tax, and tax-exempt entities, including tax compliance and tax litigation at the state and federal levels.

He advises clients on a variety of business tax decisions, such as those involving sales and use tax considerations for asset transactions, structure and formation of tax-exempt entities, federal transfer pricing issues involving cost sharing arrangements between multi-national corporations, federal and state income tax penalty abatement, analysis of payroll compliance issues and correction steps, state and local voluntary compliance regimes, and state property tax assessments. Colin also has experience in matters involving federal and state income taxation of partnerships and other pass-through entities.

Before joining Holland & Hart, Colin worked as an Appellate Law Clerk for Judge Anthony J. Navarro of the Colorado Court of Appeals, drafting civil and criminal judicial opinions.



Speaking Engagements


Bar Admissions

Professional and Civic Affiliations

  • Colorado Bar Association, Member
  • Northwestern University Club of Colorado, President
  • Opera Colorado, Second Trumpet

Unless you are a current client of Holland & Hart LLP, please do not send any confidential information by email. If you are not a current client and send an email to an individual at Holland & Hart LLP, you acknowledge that we have no obligation to maintain the confidentiality of any information you submit to us, unless we have already agreed to represent you or we later agree to do so. Thus, we may represent a party adverse to you, even if the information you submit to us could be used against you in a matter, and even if you submitted it in a good faith effort to retain us.