About

Stewart Advisory Services, LLC, is a fee-based financial planning and investment advisory firm. Our mission is to give you objective financial advice that fits your situation and helps you achieve financial freedom. We create professionally customized financial plans that take into consideration your needs and desires. We are a money management firm that focuses on you by:

  • Listening to your situation so we understand your needs.
  • Putting your interests first.
  • Providing you with unbiased advice.
  • Recommending a suitable mixture of investments that work towards your goals.
  • Monitoring your progress and making adjustments when appropriate.

If any of these questions resonate with you, contact us:

  • How can I simplify and organize my financial world?
  • Am I retirement ready?
  • Can I increase my yield without increasing my risk?
  • How can I pay for my children’s college education?
  • Do I have enough protection for my family?
  • Do I need estate planning?
  • Do I have enough income for my life?
  • How do I protect my assets?
  • How do I leave a legacy to my children? To a charitable organization?

Call us for a no-obligation first meeting. We will listen to you, determine your needs and ask you how we can help.


Clint Sandmann, CFP®
President/CEO

Clint Sandmann, investment advisor representative and President of Stewart Advisory Services, LLC, has worked in the securities industry since 2007. He holds a Series 65 securities license. Clint received his Associates degree from Tarrant County Community College, Bachelor of Science degree from Kansas State University in business administration.  He also received his Certificate in Financial Planning from Boston University.  Clint is also a CERTIFIED FINANCIAL PLANNER™. The CFP® marks identify those individuals who have met the rigorous experience and ethical requirements of the CFP Board, have successfully completed financial planning coursework and have passed the CFP® Certification Examination covering the following areas:  professional conduct and regulation, general financial planning principles, education planning, risk management and insurance planning, investment planning, tax planning, retirement savings and income planning, and estate planning.  CFP® professionals also agree to meet ongoing continuing education requirements and to uphold CFP Board’s Code of Ethics and Professional Responsibility, Rules of Conduct and Financial Planning Practice Standards.

He has lived in the Manhattan, Kansas, area since 2005 and is active in the community. He serves as a diplomat for the Manhattan Chamber of Commerce and is a member of Kiwanis International. Clint also serves on the Downtown Manhattan Board and The Financial Literacy Council.

Clint is a native of Frankfort, Kansas. He is married to Stacy Sandmann, who is currently the Stewart Financial LLC Office Manager.


Aaron Windhorst
Investment Advisor Representative

Aaron is an investment advisor representative with Stewart Advisory Services, LLC. As a graduate of Kansas State University in 2005, Aaron holds a Series 65 Securities License and is also licensed to sell Life and Health Insurance in the state of Kansas. He believes in cultivating quality relationships with his clients to help them meet and exceed their personal and professional financial goals. His goal with each client is to develop a plan that meets his or her specific needs or lifestyle. His specialties include investment management, estate planning, cash flow planning, strategic tax planning, charitable giving strategies, life insurance services, and annuities.

Aaron grew up in Olathe, KS and has lived in the Manhattan, KS area since 2001 where he is active in the local community. He is part of the Manhattan Chamber of Commerce and is member of Konza Rotary Club serving on the Community Service committee. He is married to Christina Windhorst, an Optometrist with The Eye Doctors. They have a young son named William and two Golden Retrievers named Finn and Dublin.  He enjoys spending time with family, attending KSU sporting events, and is an avid outdoorsman.


Deb Dukes
Office Manager

Deb previously worked for Clint as his Branch Office Administrator when he was with Edward Jones so her face may look familiar to some of you. She worked in the financial advisor industry for nine years holding a Series 7 and Kansas security licenses along with a Kansas life and health license for about eight years, took a break and is now back with Clint until he allows her to retire. She calls clients to schedule appointments for both Clint and Aaron, processes and tracks the paperwork and can answer some of the questions that you may have.

Deb grew up in Southwest Missouri and moved to Manhattan in late 1992 when she was assigned to Ft. Riley. She and her husband, Fred are both retired from the US Army and have five boys between them with 11 grandchildren that they enjoy spending time with. She is avid about her St. Louis Cardinals, quilting and working in the yard when time and weather permit.