Our Team


William J.  Moder, IV


  • Tax Services

Industries & Specialties

  • Energy & Related Industries
  • Private Investment Companies
  • Real Estate

William J. Moder, IV, CPA, CFE

Tax Manager

Bill joined Sisterson in 2017 after spending six years in banking and a national public accounting firm. He provides tax compliance, consulting, and planning for corporations, partnerships, limited liability entities, and individuals. His areas of expertise include multi-state taxation, real estate, oil & gas, service, investment companies, and high net worth individuals.

Bill lives in the South Hills with his wife, Bethany, and their senior rescue beagle, Ripley..


  • B.S. in Business Finance, Waynesburg University
  • B.S. in Accounting, Carlow University

Professional Certifications:

  • Certified Public Accountant (Pennsylvania)
  • Certified Fraud Examiner

Professional Affiliations:

  • American Institure of Certified Public Accountants
  • Pennsylvania Institute of Certified Public Accountants
  • Association of Certified Fraud Examiners