Exceptional People. Innovative Ideas. successful Clients. 
Henry C. Siekmann CPA

Henry C. Siekmann, CPA

Principal  |  Belleville


henry.siekmann@scheffelboyle.com  |  618.233.2641


Areas of Expertise

  • Audit & Assurance
  • Taft-Hartley Plans and Audits
  • Accounting Practices
  • Tax Planning & Preparation

Specialty Industries

  • Small Businesses
  • Employee Benefit Plans
  • Non-Profit Agencies
  • Governmental Bodies
Education & Certifications
  • B.S.B.A., Accounting, University of Illinois, 1969
  • Certified Public Accountant (CPA), 1973



Secret to Success: “If you take care of your people, your people will take care of your customers, and your business will take care of itself.” –J.W. Marriot



Henry works out of Scheffel Boyle’s Belleville office and uses his over 45 years of public accounting experience to train younger staff and be a trusted resource for his colleagues. He serves as an audit engagement principal for field work with a variety of clients, including governmental bodies, non-profit agencies, and construction companies. Henry’s experience with Taft-Hartley Plans has proven extremely valuable to his team at Scheffel Boyle during numerous audit engagements.


Henry is originally from Belleville, Illinois, but has lived in Shiloh with his wife, Donna, for the past 25 years. He has two daughters and is excited to say he is Grandpa to three grandsons. Henry is extremely active in his local community and donates countless hours of his free time to numerous organizations.


In his spare time, Henry likes to golf and spend time with his grandkids outside…when the St. Louis weather allows it. He says he comes to work every day because he enjoys the relationship he has with his clients, as well as the camaraderie and teamwork atmosphere at Scheffel Boyle.



Community Involvement, Past & Present

  • Greater Belleville Chamber of Commerce, Member
  • Violence Prevention Center, Finance Committee
  • Shriners Hospital for Children-St. Louis, Board of Governors
  • Belleville Economic Progress, Member

Professional Organizations

  • American Institute of Certified Public Accountants (AICPA)
  • Illinois CPA Society (ILCPAS), Past President-Southern Illinois Chapter
  • Southern Illinois Builders Association (SIBA)
  • Association of General Contractors (AGC), Missouri & Illinois Chapters


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Dennis E. Ulrich Michael E. Fitzgerald Steven C. Pembrook Steven P. Langendorf Scott A. Weber Mark E. Glueck Russell E. Gregson Brian A. Otten
Henry C. Siekmann Richard E. Reno Dean S. Salvatore Annette M. Hipkiss Mark J. Korte Kimberly S. Loy Keith G. Brinkmann Dale B. Holtmann