Sisterson & Co. LLP is one of the largest independently-owned CPA firms in the Pittsburgh area. Our professionals provide tax, audit and assurance, consulting, and commercial lender services to clients regionally and across the nation.

For 90 years, our philosophy has been consistent - commit to excellence, the highest of ethics, and personal service in each engagement for every client.

What differentiates us from other firms is what we call the Sisterson Standard.  Simply, these are the standards by which we work with our clients and how we run our engagements:

  • Partner involvement in engagements
  • Technical expertise in complex matters
  • Commitment to integrity, competence and objectivity
  • Dedicated and responsive staff with low turnover
  • History of exemplary client service

Contact us at to learn more.