About Sisterson

Sisterson is one of the largest independently owned certified public accounting and advisory firms in the region.

About Sisterson

Independently Owned

Sisterson & Co. is a partnership of 14 individuals. For more than 95 years, the firm has grown organically (no mergers or acquisitions) and has developed a culture centered around client service, proven by decades of service to large, successful and discerning clients who continue to rely on our firm for sound advice with their complex business affairs. Sisterson’s client service culture has developed over time into a unique blend of broad technical expertise, expected from a larger firm, yet with a close personal approach.

Continuing Professional Education & Professional Development

At Sisterson, everyone counts, and we work to provide a positive environment for our employees. We pay special attention to the nurturing of our professional staff and believe that continuing education is an invaluable component of staff development. Our continuing education programs provide staff with learning opportunities that exceed the requirements of the American and Pennsylvania Institutes of Certified Public Accountants. Sisterson sponsors an extensive array of in-house continuing education courses developed and delivered by senior management, as well as by outside professionals. Staff members also attend conferences sponsored by the AICPA, PICPA, and AGN International. Leadership Sisterson is the firm's internal program to develop leadership and practice development skills of the professional staff.

Collaborative Environment

Employees and partners at Sisterson work closely together, whether it be on technical or administrative issues, to best serve our clients. Work groups and client teams meet regularly. Our open-door policy allows for frequent communication to keep the work product moving forward. And, having only one office means that we can get answers and resolve issues quickly.

This environment often leads to friendships and we offer activities to enourage this comradery. Each year, the Firm hosts a picnic, service award event, and holiday luncheon. We also celebrate College Colors Day and any Pittsburgh sports team celebration!

Giving Back

As a Pittsburgh-based firm, Sisterson has made a commitment to the region and its non-profit community. Our employees and partners support clients and non-clients by volunteering, participating in charity walks/runs, attending events, as well as committee and board involvement. Sisterson representatives are encouraged to participate in volunteer activities as part of the firm’s Sisterson Cares program.

The firm also believes in educating and mentoring groups that are traditionally underrepresented in the accounting industry. We are proud to support the National Association of Black Accountant's annual ACAP (Accounting Career Awareness Program) and to participate in Disability Mentoring Day each year.


We believe our commitment to encouraging balance and quality of life has resulted in our employees being more productive and more satisfied with their careers. Sisterson offers alternative work arrangements and flexible schedules so that employees can deal with personal matters and family obligations. The partner group supports and encourages input from internal groups including our advisory, social, and wellness committees, so that the flexible, but challenging, environment is maintained.

One Firm, One Office, One Mission

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.

Sisterson has grown over the years, not due to mergers or acquisitions, but to work from new and existing clients and maintaining our talent base. An important part of our growth has been providing a challenging, yet rewarding, experience for our staff, helping us maintain consistent client service and a pipeline of talent for the future.

Our professionals are more than accountants. They are client advocates who look beyond the numbers, ask questions, and offer solutions. From partners to associates, the Sisterson team is there for our clients and cares about their success. We believe in being reliable, doing the right thing, and keeping our word to always deliver what we promise.

Because we have been in business for more than 95 years, our professionals have dealt with scores of issues. Over the years, our firm has successfully adapted to changes in the world and in our industry. Through successful succession, we have grown and prospered, and so have our clients.

We are always looking for ways to serve our clients more effectively with continuous training. This commitment has lead to the firm's favorable reputation for outstanding technical capabilities.

Sisterson is a member of AGN International, a worldwide association of separate and independent accounting and advisory firms. Our membership gives us direct access to practical business advice globally and added depth nationally, within a structure of trusted relationships that is designed to deliver high standards at an affordable cost; an antidote to the complexity and cost of some global providers.