Catherine Marchelletta, CPA, MST

Managing Director

Catherine Marchelletta is a managing director at the CPA firm O’Connor, Pagano and Associates and a co-founder of Forensic Valuation Litigation, LLC.

With more than three decades of accounting experience, Catherine is a knowledgeable professional. Catherine has extensive experience with a wide range of companies including real estate developers, construction contractors, large privately owned companies, private equity groups, and manufacturers. She has more than 30 years of experience in the tax and consulting practice sectors, with an emphasis in strategic tax planning; mergers and acquisitions, business valuations, business succession planning, multi-state tax planning, entity structuring, and business reorganizations.

Catherine also leads the Forensic Litigation Valuation practice for O’Connor, Pagano. Catherine and her team work with closely-held businesses, attorneys, banks, and other clients on a wide range of forensic accounting, valuations and litigation support services.  

She was previously Tax and Consulting Partner at a large regional CPA firm. For more than 30 years she has provided a wide range of tax and consulting services to the firm’s diverse client base.

A dedicated and trustworthy professional, Catherine strives to be a team player. She considers herself an advocate and trustworthy advisor for her clients. Catherine was inspired to pursue a career in accounting by her teachers. She attributes her career success to her dedication, trustworthiness, and mentors.

Catherine currently lives in Moon Township, Pennsylvania. She enjoys the city for its fantastic cultural district. In her free time, she likes to cook and attend theater shows.


  • Certified Public Accountant (CPA) – Pennsylvania
  • Masters of Science In Taxation (MST)


  • American Institute of Certified Public Accountants (AICPA)
  • Pennsylvania Institute of Certified Public Accountants (PICPA)
  • Allegheny Tax Society
  • Pittsburgh Venture Capital Association
  • Various Committees BKR International


Robert Morris University

  • Master of Science in Taxation (1992)
  • Bachelor of Science in Business Administration (1982)
Catherine Marchelletta headshot