David E. Koslakiewicz of Port Washington, Wisconsin, entered eternal life on Tuesday, May 5, 2026, at the age of 79. He was born in Duluth, Minnesota, to Edwin and Eleanor (née Hendrickson) Koslakiewicz.

After graduating from high school, David earned his bachelor’s degree from the University of Minnesota Duluth and later received his master’s degree from the University of Wisconsin–Milwaukee. A dedicated mathematics educator, he taught at Shorewood High School, Cedarburg High School, and his alma mater, UWM. He served as Director of Technical Training at MGIC Investment Corporation.

On June 3, 1972, David married the love of his life, Nancy Leone. Together they made their home in Milwaukee and later Shorewood before settling in Whitefish Bay, where they spent 33 years raising their family. In 2015, David and Nancy moved to Port Washington.

David embraced life with many interests and found joy in woodworking, listening to country music, and driving his Mustang. Being active in his children’s lives was especially important to him, and he devoted many years to coaching Little League and football. He was also involved with the Boy Scouts for 20 years.

David was a member of St. John XXIII Parish. He proudly served for 23 years in the Air National Guard, 128th Air Refueling Wing, and was also a member of American Legion Post 82.

David is lovingly survived by his devoted wife of 53 years, Nancy; his sons, Daniel (Jennifer), Brian, and Nathan; and his grandson, Carter. He is further survived by his sister, Barbara (Daryl) Jakubek, along with many other cherished relatives and dear friends.

He was preceded in death by his parents; his brother, Duane (the late Shirley) Koslakiewicz; and his sister, Carol (the late Elwood) Youngberg.

A gathering to honor David’s life will be held on Thursday, June 25, 2026, from 3-5PM at Van Ells-Schanen American Legion Post 82 in Port Washington, Wisconsin. He will be laid to rest with Military Honors at the Minnesota Veterans Cemetery in Duluth, Minnesota.

Eernisse Funeral Home is assisting the family with arrangements. Online condolences may be left at the funeral home website (www.eernissefuneralhome.com) .

In lieu of flowers, memorial donations may be made to the Port Washington Food Pantry or the Tunnel to Towers Foundation.