About Sisterson & Co.

Ninety Years and Counting

In 1926, encouraged by a client impressed by his work, Douglas G. Sisterson opened his own accounting firm. The firm started with a clear philosophy - commit to excellence, the highest of ethics, and personal service in every engagement.

Over the years, the firm has successfully adapted to changes in the world and in the industry. Mr. Sisterson's name is still on the door and his philosophy has been carried on through the years. Today, Sisterson is one of the largest locally-owned certified public accounting and financial consulting firms in western Pennsylvania.

The Sisterson Standard

For 90 years, our professionals have served clients large and small with the same standard of service. What differentiates Sisterson 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 all engagements
  • Technical expertise in complex matters
  • Commitment to integrity, competence and objectivity
  • Dedicated and responsive staff
  • Exemplary client service

Areas of Specialization

The professionals at Sisterson have worked with a variety of industries and clients. Some areas of expertise are:

  • Collateral loan audits
  • Employee benefit plans
  • Energy and related industries
  • Growth companies - all stages
  • Individuals and trusts
  • Manufacturing and distribution
  • Not-for-profit entities
  • Private investors


The employees and partners of Sisterson work out of one office, in the Grant Building, in downtown Pittsburgh. This lends to a collaborative environment which is a benefit to our clients. As Mr. Sisterson did, we strive to develop long-term relationships with our clients.

Want to Learn More?

Feel free to contact us if you want to learn more. Our goal is to help you and/or your business succeed.

Call 412.594.7003 or email info@sisterson.com. We'll respond promptly.