Kiefer Bonfanti & Co. LLP

Mark E. Mersmann, CPA

Advisory Audit Partner

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“My objective is to reduce our clients’ stress levels by assisting them in coping with the complexities of compliance, regulatory, accounting and reporting requirements, so they can concentrate on managing their organizations.”

Mark E. Mersmann, CPA

Mark joined Kiefer Bonfanti in 2002, and leads the assurance services area for the firm.  In addition to Mark’s management and leadership responsibilities, he specializes in providing comprehensive assurance and information reporting services to closely held businesses and nonprofit organizations, including associations, charities, employee benefit plans, and labor unions. Mark provides a wide range of services to other CPA firms, including peer reviews, annual quality control inspections, pre-issuance reviews of audit engagements, and professional standards consultation. He has also assists other firms in implementing quality control procedures.

With over 45 years of public accounting experience, Mark’s success is a direct reflection of his strong work ethic and professionalism.  He attributes much of his success to his strong sense of integrity in all relationships and his commitment to excellence and life-long learning.

In addition to his commitment to his profession, Mark participates in family activities and is actively involved in his faith community.


  • Certified Public Accountant (CPA)
  • Chartered Global Management Accountant (CGMA)


  • American Institute of Certified Public Accountants (AICPA)
  • Missouri Society of Certified Public Accountants (MSCPA)
  • Creve Coeur Chamber of Commerce
  • Chesterfield Chamber of Commerce
  • St. Louis Society of Association Executives
    • Past Board Member

Honors, Activities & Achievements

  • American Institute of Certified Public Accountants
    • Elected Member of Council – 2008-2011
  • Missouri Society of Certified Public Accountants
    • Distinguished Service Award – 2005
    • Chairman of the Board – 2001-2002

Military Service

  • United States Army Reserve
    • Sergeant


  • Emporia State University
    • Bachelor of Science, Business Administration, Accounting (1963)