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J. William Callison


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

Bill works in close partnership with clients in the affordable housing industry to implement creative equity and debt financing on projects in Colorado and around the country.

Bill provides strategic legal solutions for affordable housing transactions and has represented clients on hundreds of low-income housing tax credit projects from Alaska to Florida. He also has substantial experience navigating New Markets Tax Credits, federal energy credits, and historic rehabilitation tax credit deals.

Bill is a preeminent practitioner in LLC and partnership law and is an authority on laws governing fiduciary duties. He advises clients in forming and financing business entities; on corporate and partnership mergers and consulting on acquisitions; and dissolution and dissociation. Bill is also sought-after as a consulting or testifying expert witness in corporate, LLC, partnership, contract, professional malpractice, and related legal matters.

Prior to joining Holland & Hart, Bill spent 25 years at a large multinational law firm. He authors two major legal treatises, writes and speaks prolifically, and has served on law faculties at the University of Colorado Law School, The University of Kentucky J. David Rosenberg College of Law, and the Tilburg Law School (Netherlands), among others.


Bar Admissions

Court Admissions


  • The Best Lawyers in America©, Corporate Law, 2006-2022; Nonprofit/Charities Law, 2008-2022; Tax Law 2008-2022
  • Colorado Super Lawyers®, Business/Corporate, 2012-2020

Professional and Civic Affiliations

  • American College of Real Estate Lawyers, Fellow
  • American Law Institute, Member
  • American Bar Association, Affordable Housing and Community Development Forum, Chair 2015-16, Vice-Chair 2013-14; Business Law Section, Chair; Partnership Subcommittee; LLC and Unincorporated Organizations Committee

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