Passed away peacefully on Tuesday, November 21, 2023 at the age of 69. Beloved husband of 5 years to Sara Kierzek (nee Neubauer). Caring step-father of Jeff (Annie) Kierzek, Justin (Christine) Kierzek and Josh Kierzek. Proud pop-pop of Alice, Lillian, Jonathan and Quinn. Brother of Tom Kelnhofer, Karen (Tom) Heim and the late Joseph (the late Asha) Kelnhofer. Further survived by other relatives and friends.

Mark was an active member of the Lionel Railroad Club-Milwaukee for many years. He served as an officer in his IBEW Retirees group. Mark enjoyed his time at the family cottage up north, ATVing and enjoying the outdoors. Sara and Mark shared a love of Beagles, music and travel.

Visitation WEDNESDAY, November 29, 2023 at Mt. Carmel Lutheran Church, 8424 W Center St, Milwaukee from 10-11:30 AM. Memorial Service at 11:30 AM. Inurnment will take place at St. Adalbert Cemetery, 3801 S. 6th St, Milwaukee at 1 PM.

A special thank you to the MICU staff at Froedtert Memorial Hospital for your incredible care.

If desired, memorials to Beagle Freedom Project or the National Kidney Foundation are appreciated.