Age 77. Departed peacefully on June 6th. Beloved husband of Marilyn (nee Fox) and (the late) Jean Koehler (nee Schwab). Cherished father of Dennis, Jr., Theresa (Kip) Cassens, Michael (Denise) Koehler, Lisa (Jason) Dixon, Ron (Sandy) Czerwinski, Richard Czerwinski, and David (Gail) Koehler. Survived by grandchildren, great-grandchildren, other relatives and friends. Dennis had a great sense of humor who loved his family and friends dearly. He was a hard worker and cherished spending time with those he loved. He was a great businessman who owned several pizza restaurants. He loved to cook and knew how to make a fantastic pizza! He worked as a manager for the United States Postal Service for 30 years. After he retired from the USPS, he used his knack as a people person and started a DJ business with his family called Knights of Sound. He was the master MC and loved to DJ weddings. He also drove a school bus for Laidlaw Bus Company. A visitation will be held on Wednesday June 12th at Hartson Funeral Home, 11111 W. Janesville Rd. Hales Corners, WI 53130 from 9 am to 11 am, followed by a funeral mass at Saint Mary Catholic Faith Community, 9520 W Forest Home Ave, Hales Corners, WI 53130 at 12 pm. Private interment.