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About Us

About Our Firm

Since 1980, M. R. Henderson and Company, P.C., has operated nationally, providing quality financial guidance to individuals and major corporations. Our expertise ranges from basic tax management to consulting.

Yankton area M R Henderson & Company, P.C. is one of the leading firms throughout the area. By combining our expertise, experience and the team mentality of our staff, we assure that every client receives the close analysis and attention they deserve. Our dedication to quality customer service is why our clients return year after year.

Our Mission

Our mission is to help clients maintain financial viability in the present, while taking a proactive approach to achieve future goals. This requires open communication to reach an understanding of our clients' needs through research and sound analysis. M R Henderson & Company, P.C. is dedicated to meeting these goals with high standards of excellence and professionalism. We have been a staple of the area's business community for years, and pride ourselves on the level of esteem we have earned.

Our Team

Michael R. Henderson
President and Managing Partner

With a career started in Colorado in 1978, Mike is a seasoned CPA that has worked with and consulted for a wide variety of organizations. 1982 saw the birth of what is now M R Henderson and Company. In 1995, Mike moved the firm from Colorado to Yankton, and in 1999, moved to its current location, retaining many of those long term clients until today.

Areas of expertise:

  • Management and business consulting
  • Strategic forecasting and planning
  • Estate and wealth transfer planning
  • Representation with IRS and state taxing authorities
  • Expert witness
  • Tax preparation and planning

Education BA Accounting, Magna Cum Laude, Metropolitan State College, Denver, Co
Certifications CPA 1980

Billie Henderson

Billie graduated from Fort Hays Kansas State University with a Bachelor of Science in Accounting in May 1979. She has been a CPA since November 1979. She was the Reporting Accountant as well as a Cost Accountant for Honeywell, Inc., SSED Division in Colorado Springs. She then served as Controller for a rapidly growing medical/dental center before joining M R Henderson and Company in 1995.

Areas of expertise:

  • Organizing accounting systems
  • Providing sound financial advice
  • Quickbooks training and assistance
  • Creating order from chaos

Education BS Accounting, Fort Hays Kansas State University
Certifications CPA 1979

James M. Henderson
Staff Accountant

James began his public accounting career in June, 2008 while attending college. He worked for the firm part-time until he graduated from the University of South Dakota with a Masters of Professional Accountancy Cum Laude degree in December, 2010. He went to work for M R Henderson & Company, P.C. full-time after graduation.

James’s areas of focus in public accounting:

  • Tax preparation and planning
  • Management and business consulting
  • Representation with IRS and state taxing authorities
  • Financial statement preparation and review
  • Financial planning

Education Masters of Professional Accountancy, Cum Laude, University of South Dakota

Suzan Rasmussen Gass
Office Manager

Suzan started working for the Yankton office in December 1998. She earned a Bachelor of Business Administration degree from Yankton College in 1980 and a Master of Business Administration degree from the University of South Dakota in 1982. Her prior work experience includes 9 years in bank operations.

Suzan’s areas of expertise:

  • Bookkeeping
  • Payroll taxes, excise taxes, IFTA taxes, etc.
  • Quickbooks training and assistance
  • Workmen’s Compensation Audits/Reviews
  • New business tax applications (federal and state)

Education Bachelor of Business Administration, Yankton College
MBA, University Of South Dakota

Karen Dolejsi
Office Assistant; Bookkeeper

Karen is a Yankton native. She has worked multiple jobs over the years focusing in retail, with a stint in manufacturing before becoming a partner in a very prosperous business. While there, she maintained the books for 13 years. Upon the sale of the business she joined the M R Henderson staff in November of 2012.

Karen specializes in:

  • Bookkeeping
  • Sales and excise tax preparation
  • Payroll and Payroll tax reporting
  • Assisting with front office duties


  • M R Henderson & Company, P.C.
  • 118 W 3rd St
  • Yankton, SD 57078
  • Telephone: (605) 665-6007
  • Fax: (605) 665-6008