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

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


  • Certified Public Accountant – Pennsylvania and New York

Memberships and Affiliations

  • American Institute of Certified Public Accountants (AICPA)
  • Pennsylvania Institute of Certified Public Accountants (PICPA), Peer Review committee including RAB sub-committee, Employee Benefit Plan committee including the EBP Technical Issues sub-committee Government Accounting and Auditing
  • Federation Early Learning Services –Chair, Operation and Development Committee Chair
  • Beiteinu -Treasurer