About Us

The Insurance Group

Since 1949 The Insurance Group has provided individuals and businesses in the Clinton area with exceptional service and insurance products. As an Independent Agency we represent many insurance companies and can offer a variety of choices to customize a plan to meet your unique needs. We are dedicated to you and are committed to treat you as a person, not a policy.

Insurance Built Around
your Needs and Requirements

Our Team

Mark Mangler


Mark is a graduate of Clinton High School and Kirkwood Community College. He started his insurance career in 1982 and joined The Insurance Group in 1994. He is the President of the agency. He holds the Life Underwriter Training Council Fellow (LUTCF) designation and is licensed in all lines of insurance in Iowa and Illinois. He is active in the community and has served on many committees and boards.

Diane Christensen

Vice President

Diane began her career with The Insurance Group in 1977 as receptionist. She is currently the Vice President. Her responsibilities include selling and servicing personal and commercial clients with their insurance needs. She is licensed to do business in Iowa and Illinois. Diane is very active in the Clinton & Fulton communities & in various organizations.

Mike photo

Mike Determan


Mike joined The Insurance Group in 2007 with 15 years of sales and customer service experience. Mike is licensed in Iowa and Illinois for property, casualty, life, health and crop insurance. He belongs to and volunteers with several organizations in the community. Mike’s focus is to help clients develop and maintain an insurance program to meet their specific needs.

Drew Mangler


Graduated from Clinton high school in 2003 and served in the US Army from 2003-2009 as a Cavalry Scout with two combat deployments to Iraq. Graduated from the University of Iowa in 2013 with a Bachelors of Arts an then worked in commercial lines underwriting for United Fire and Casualty in Cedar Rapids from 2014 to 2017. Joined the Insurance Group in 2017.

Ashlee Trafford


Ashlee began her career with The Insurance Group in 2011 as a receptionist. She has been in the insurance business since 2004 and is licensed in Personal and Commercial Lines. In her spare time Ashlee enjoys riding motorcycles and reading.

Kim Barten

Customer Service Representative

Kim began her career with The Insurance Group in 2018 as a customer service representative. Kim resides in Clinton and enjoys working on crafts, attending craft shows, and spending time with family and friends.

What We Offer

  • For Individual
  • For Business
  • The insurance transaction involves the insured assuming a guaranteed and known relatively small loss in the form of payment to the insurer in exchange for the insurer's promise to compensate the insured in case of a covered loss.
Liberty Mutual
State Auto
Wright Flood

Contact a Member of Our Team