Cathy Seiler joined Brinker Simpson as a Partner in October 2014, bringing more than 25 years of experience to the firm. Before joining, Cathy was a Senior Manager at a national accounting firm and the Director of Quality Control for a large regional firm.

Cathy provides sophisticated audit, accounting, general business advisory, and tax services to clients in a broad range of industries, including manufacturing, wholesale distribution, construction, professional services, nonprofit, governmental, and employee benefit plans.

Cathy resides in Lafayette Hill, PA, with her husband, Marc.

Areas of Concentration

Audits of Non-Public Companies
Audits of Nonprofit Organizations
Audits of Local Governments
Audits of Employee Benefits Plans
Quality Control and Peer Review
Forensic and Litigation Engagements
Strategic Tax Planning and Compliance for Companies and Individuals

Industries Served

Wholesale Distribution
Construction Contractors
Professional Services and Consulting
Local Government and Municipal Authorities
Nonprofit Organizations
Homeowners’ Associations


Certified Public Accountant - Pennsylvania, New York and Florida
Bachelor of Science in Business Administration and Accounting, Temple University

Memberships and Affiliations

American Institute of Certified Public Accountants (AICPA)

Pennsylvania Institute of Certified Public Accountants (PICPA)

- Government Accounting and Auditing Thought Leadership Committee
- Employee Benefit Plans Thought Leadership Committee
- RAB Subcommittee

Federation Early Learning Services, Chair, Operation and Development Committee

Beiteinu, Treasurer



If everything is perfect, you will never learn.

Cathy Seiler, a partner at Brinker Simpson, recently joined Marcia Zaruba O'Connor as a guest on The O'Connor Group's Top 3 Podcast. Cathy shared how to climb the corporate ladder by not comparing yourself to others and the importance of pride, patience, passion, service, and personal accountability.

👉Subscribe and Listen: https://hubs.li/Q011VPKy0

Learn More

Brinker Simpson and Company is pleased to announce that partner Cathy Seiler has been selected to join The Forum of Executive Women, a membership organization comprised of 500 of the most influential women leaders in the Philadelphia region. In this role, Cathy will work closely with other executive women to expand the impact and power of women in the workplace and beyond.

Learn More