John “Sean” E. Jennings, III


John “Sean” E. Jennings, III



Sean Jennings is an associate attorney at Ireland Stapleton Pryor & Pascoe, PC. He represents businesses in regulatory, government relations and corporate matters. His practice includes advising clients in regulated industries on licensing, permitting, zoning, compliance, government enforcement actions and government investigations. Mr. Jennings works with clients in diverse industries such as alcohol beverages, cannabis, hemp/CBD, transportation, gaming, energy, public utilities and short-term rentals. He represents clients at hearings before state and local agencies, boards and commissions, and legislative councils. He also assists businesses with corporate transactions, contracts, trademarks and intellectual property matters.

Mr. Jennings has served on public working groups and rulemaking committees for the State of Colorado and the City of Denver. Prior to joining the firm, he was the hearings manager for the City of Denver’s Department of Excise and Licenses, where he managed the administrative hearings process for City business licenses and conducted public hearings as a hearing officer. During law school, he was the Executive Editor of the Villanova Law Review.

Presentations & Publications

  • Co-author,“Bankruptcy and State Alternatives for Marijuana Businesses,” September 7, 2018
    • Author, “Current Topics in Colorado’s Regulatory Landscape,” 92 Denver Univ. Law Review Online 183 (2015)
    • Author, “Skiing Close to the Edge of Trademark Law: The Enforceability of Geographically Descriptive Marks in Vail Associates v. Vend-Tel-Co.,” 55 Villanova Law Review 205 (2010)
    • Presenter, Marijuana and the Nonprofit Industry (2019)
    • Presenter, Hospitality Law, Colorado Hotel & Lodging Association Conference (2016)
    • Co-Presenter, Regulatory Update, Recreational Marijuana CLE (April 2015)
    • Co-Presenter, Navigating the Agencies, Alcohol Beverage Law CLE (January 2015)
    • Co-Presenter, Colorado Marijuana Licenses, Recreational Marijuana CLE (June 2014)


    • Colorado Bar Association
    • Denver Bar Association

    Community Involvement

    • Downtown Denver Partnership, Retail Council Member
      • WorldDenver, Board Secretary
        • WorldDenver Young Professionals, Board Member
        • D.A.C. Young Professionals
        • D.U. Law School Professional Mentoring Program
        • Brother Rice Colorado Alumni Committee Member

        Personal Interests

        Skiing, mountain biking, hiking and reading.

        Contact Info


        • Admitted to practice in Colorado