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Find Your Local Wealth Management Team Members

Few corners of banking involve such immense potential as wealth management. And few require such excellence in stewardship of your assets. We’re proud to have some of the most disciplined, imaginative experts in our region on our team helping to manage all your achievements — and all your potential.


Mark Sivertson

Mark Sivertson

Senior Vice President
6810 S. Minnesota Ave. | Sioux Falls SD
(605) 961-3911

Mark started his career in the early 1980’s at a law firm in Bowman, North Dakota. He practiced law in the areas of guardianships, probate and corporations. From there, he moved onto working for financial institutions in North Dakota and South Dakota in roles such as Trust Officer, Trust Manager and Senior Vice President of Trust and Wealth Management Services. Mark enjoys giving innovative insights to individuals, families, businesses and non-profits – giving them guidance and options for managing their legacy.


  • Cannon Financial Institute, School of Foundation Management
  • Advanced Trust Investment School, University of Notre Dame
  • National Graduate Trust School, High Honors Graduate, Northwestern University
  • National Trust School, Northwestern University
  • The Schools of Banking, Trust School
  • University of North Dakota School of Law
  • Bachelor’s degree from Concordia College. Majors were Business Administration, Accounting, History and Political Science. Magna Cum Laude.
  • Governor’s Task Force on Trust Administration Review and Reform
  • President, Rotary International Downtown Sioux Falls
  • Sioux Falls Firefighter’s Retirement System Board of Trustees
Sandy Bickett

Sandy Bickett

Trust Specialist
6810 S. Minnesota Ave | Sioux Falls SD
(605) 961-3906

Sandy has been involved in the financial industry for over 20 years. She has experience with many aspects of banking including personal banking, business banking and wealth management services. Sandy looks forward to seeing you at our Grand Prairie location on south Minnesota Avenue. 

  • Sharing Christmas volunteer
  • Junior Achivement
  • Habitat for Humanity
  • United Way Coins for Kids
  • Help!Line
Sandy Bickett

Keith Johnson

Trust Operations Officer
6810 S. Minnesota Ave | Sioux Falls SD
(605) 670-9019

Keith has been with AB&T for 8 years. He started as a teller in our Huron location and has worked his way through the various departments. Currently, Keith is the Officer of our Trust Operations department and facilitates the processing of trades and other needs for our customers. Keith has worked in many departments; giving him a unique insight on the workings of the bank and allows him to better assist customers on a day-to-day basis.

Sandy Bickett

Ryan Krome

Trust Officer
6810 S. Minnesota Ave | Sioux Falls SD
(605) 670-9022

Ryan Krome is a VP, Trust Officer with American Bank & Trust at our Sioux Falls – Grand Prairie location.

He grew up in Mitchell, SD, where he graduated from high school before continuing his education at Southwest Minnesota State University (SMSU) on a basketball scholarship. While at SMSU, Ryan obtained a Business Administration degree along with a minor in Marketing. Ryan’s wife, Jeana, also grew up in Mitchell, SD. They have been married since 2012 and have three boys – Kruz, Kash, and Knox. Outside of work, Jeana and Ryan both enjoy coaching and watching their boys play different sports throughout the year. They also enjoy spending time together, golfing, and going on vacations.

‘Dedication sees dreams come true.’ That’s Ryan’s promise to you. He is dedicated to your success. Ryan and our team of experts at American Bank & Trust will work to achieve a greater level of financial success. Your dream of true financial freedom becomes our goals for you and your family. Working together we can achieve your financial goals.

Not FDIC Insured | Not Bank Guaranteed | May Lose Value | Not Insured by any Federal Government Agency | Not a Bank Deposit 

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