Mariner Kemper is chairman and chief executive officer of UMB Financial Corporation. He has been with the company for more than 30 years and has served and led in many roles, including president of UMB Bank Colorado, n.a. and executive vice president of UMB Financial Corporation. Under Mariner’s leadership as CEO for more than 20 years, UMB has grown from a $6.9 billion, Midwest-focused bank into a super-regional, financial services powerhouse with a presence in 13 states and $71.8 billion in assets (as of June 30, 2025).