Founded in 1975 by Fredrick (Fritz) Gierach and Leroy (Butch) Walterlin, representing only three insurance companies at the time; Ohio Casualty Insurance Company, West Bend Mutual Insurance Company, and Germantown Mutual Insurance Company. Today, Colonial Insurance Agency represents dozens of companies, of which West Bend Mutual and Germantown Mutual are still proudly represented. During 1988, a new strip mall opened on Mequon Road (the main in-road to Germantown) offering retail and office space. This became the new home of Colonial Insurance Agency, with which it is still located today. Shortly after the move, Mr. Walterlin retired, allowing Fritz Gierach to bring in some new partners. The search didn't take long, and in 1990, Donald MacLeod and Mark Besting joined with Fritz to make Colonial Insurance Agency a true marketing force in insurance.

As Colonial moved into the next decade, Fritz decided to spend more time enjoying life and retired from Colonial in 1998. As Don and Mark became the sole partners of Colonial Insurance, the Agency continues to grow, protecting the assets and families of thousands of clients. From auto and home, to life and health, Colonial is able to handle almost every insurance need of the personal or commercial insurance client.

Since it's founding, Colonial has been a proud member of the Professional Insurance Agents of Wisconsin (PIAW). This organization is dedicated to maintaining the professionalism and integrity of the independent agent and the independent agency system.

Colonial Insurance Agency is also a proud supporter of the community; both financially and volunteering of their time.

Organizations Supported

Germantown Little League

Germantown Flag Football

Germantown Junior Basketball

Menomonee Falls Little League

Germantown 4th of July Fireworks

The Irving J Seher Boys and Girls Club

"Adopt-a-Kid for Camp" program

Proud Members

Germantown Chamber of Commerce

Community Insurance Information Center

Kiwanis International

Professional Insurance Agents of Wisconsin