G. Mark Mickelson, President/Owner

G. Mark Mickelson founded Mickelson & Company, LLC, in 2005. Mickelson is a Certified Public Accountant (inactive) and a member of the South Dakota Bar Association.

Prior to Mickelson & Company

2004 - Present: Mickelson became an active owner in the ongoing development of 200 acres of land (light industrial, office and commercial) in northwest Sioux Falls

2004 - 2005: Mickelson and a partner handled the corporate divestiture process for over 50 locations of a mechanical sub-contracting subsidiary owned by Lennox International, a Richardson, Texas based Fortune 500 Company

1997 - 2003: Mark was employed by Northwestern Corporation, a public utilities company

1993 - 1996: Executive with Hegg Companies, Sioux Falls real estate development company (where he arranged his first tax credit based financing)

1988 - 1990: Audit staff member for Deloitte & Touche (f/k/a Touche & Ross) Minneapolis, Minnesota


1993 Magna Cum Laude, Harvard Law School, Cambridge, Massachusetts

1988 Highest Honors, University of South Dakota, Vermillion, South Dakota (BS in Accounting and Business Administration)

Organizations & Leadership

  • Bristow Group, Inc (board chairman)
  • ISG (board member)
  • South Dakota Community Foundation (past board chair)
  • USD Foundation (past board member)
  • Sioux Falls Area Chamber of Commerce Board (member)
  • Sioux Falls Development Foundation (past chair)/Forward Sioux Falls Board (past member)
  • South Dakota Board of Economic Development (past member)
  • Sioux Falls Downtown Rotary (past president)
  • Sioux Falls YMCA (past board member)
  • Metabank (past board member)
  • Ducks Unlimited (lifetime member)
  • Pheasants Forever (member)
  • American Short Line and Regional Railroad Association (member)

Public Service

2012 - 2016: South Dakota House of Representatives (member)

2015 - 2016: South Dakota House of Representatives - Speaker Pro Tempore, House Judiciary Committee (chair)

2017 - 2018: South Dakota House of Representatives - Speaker, House Legislative Procedure Committee (chair)


Mark and his wife, Cynthia Mickelson, have three sons and live in Sioux Falls. He enjoys hunting, fishing, golfing and watching his sons’ activities.


Mark Mickelson can be reached at mark@mickco.com or through Amy Uttecht via:

Phone: 605-977-4873 ext. 3

Email: amy@mickco.com