In 1973, Thelen Advertising originated as TetraSonics, a recording studio intending to produce commercial audio (e.g., radio jingles), polka albums and demo tapes for rock bands playing at the Press Bar. One day in 1976, a happy audio customer surprised us by asking for a newspaper ad and a billboard design to go along with their jingle. Long story short: Three sentences later, Thelen Advertising was born.

Throughout our history, we have had the same philosophy – We focus on results, the efficient use of marketing dollars, and an impressive return on your investment.

Mark Thelen Co-Owner	Ann Thelen Co-Owner

Ronn Paulson Account Manager	Becky Tenvoorde Account Development	Danita Van DeWalker Office Manager
Randy Tenvoorde Graphic Artist Web Specialist	Aaron Guck Graphic Artist	Angela Brinkman Graphic Artist Web Designer