My Team

I take customer service very seriously. So does my staff. Together, we are committed to providing exceptional customer service to all of our clients.

If you need to schedule an appointment, make changes to your policy, submit a claim or request any other service, please let us know. We will respond promptly.

Colleen M Brown

Colleen M Brown, CLU®, RICP®

Associate Financial Representative
Office 319-351-5075

Colleen began her career with Northwestern Mutual in 2008. In June 2012 joined Dennis Visser during which time she has earned the Chartered Life Underwriter,CLU®)Retirement Income Certified Professional, (RICP®) designation 2018 through The American College.

Colleen holds Bachelor of Arts degree in from the University of Iowa. Colleen encourages clients and prospective clients to seek an advisor with experience and one whom they feel they can trust. She is passionate about helping clients with their personal and family’s insurance, investments and finding the right resources associated with Financial Security Planning.

Drew Andrew Walters

Drew Andrew Walters

Office 319-351-5075

Drew began his career with Northwestern Mutual in January 2013. He attended the University of Iowa receiving a B.A. in American Studies.Drew currently holds his Series 6, 63 as well as Life, Accident and Health licenses and is currently pursuing his RICP designation. 

Drew assists Denny’s team with the creation, proposal, and management of financial plans.  He also assists with:

  • Policy Changes and Information changes
  • Billing and Premium Payments
  • Medical Exams and Underwriting  

Drew lives in North Liberty and in his free time enjoys spending time with friends, family, cooking, volleyball, Ultimate Frisbee, running, cycling and golf.  While staying active he is also an avid Hawkeye fan and enjoys traveling.


Dennis G Visser, CLU®, ChFC®

Financial Advisor

  • Office 319-351-5075 ext. 7018

To learn more about Northwestern Mutual Investment Services, LLC and its financial representatives, visit: FINRA BrokerCheck