• Principal, Ryan, Downers Grove office
    • Specializes in providing property tax commercial services to clients in a variety of industries.
  • Senior Director, Property Tax Appeal Consulting, national accounting firm
  • Director, Property Tax Appeal Consulting, national accounting firm
    • Led the Chicago office and Midwest region for commercial real estate property tax appeal consulting, directly overseeing teams in nine midwestern states.
    • Headed regional sales effort and was directly responsible for landing largest clients.
    • Was involved with clients and appeal work for complex property and compliance groups, including leading groups during transition.
  • Senior Valuation Consultant, property tax firm
    • Directly oversaw and managed the Cook County, Chicago collar counties, and State of Minnesota real estate tax portfolios and shared responsibility of the Midwest regional office (nine states).
    • Was responsible for all aspects of business operations including financial performance, budgeting, sales, marketing plans, hiring, and management of an extensive property portfolio.
    • Acted as lead manager of several nationwide portfolios based out of Chicago.
  • Manager, Property Tax Consultant, property tax consulting firm
    • Managed the firm’s Chicago property tax consulting group and was responsible for implementing the firm’s aggressive growth plan.
    • Reviewed and filed protests for Illinois and Minnesota portfolios.
    • Handled the entire range of commercial and industrial properties.
    • Was responsible for nationwide portfolios with properties located primarily in the midwestern and southeastern regions of the country.
  • Appraiser, Commercial and Industrial Real Estate, premier Cook County appraisal firm
    • Analyzed and appraised national and local industrial, commercial, and office building real estate.
    • Gained extensive experience with Cook County real estate with exposure to national real estate.


Mr. Brannigan lectures on various tax topics for Ryan clients and the Ryan Professional Development Program. Additionally, he has appeared as a speaker for the following organizations:
  • Council On State Taxation
  • Institute for Professionals in Taxation
  • Interstate Tax Corporation


  • Institute for Professionals in Taxation
    • CMI Designation (2002–Present)


  • Master of Business Administration Degree, Loyola University Chicago
  • Bachelor of Arts Degree, Economics, University of Notre Dame
    • Beta Gamma Sigma Scholar