John A. Kreuser, age 59, passed away on Friday, January 23, 2026, after a courageous 8-month battle with cancer, at his home surrounded by family and close friends. He was born on March 23, 1966, in Hartford, WI to Donald and Judith (nee Krantz) Kreuser.
John is survived by his loving wife, Beth (nee Erickson); children, Michael Kreuser, Zach (Payton) Brewer, Erika Kreuser, Lilian Kreuser and Katelyn Brewer; brother, Steve (Aimee) Kreuser; maternal aunts, Joyce Krantz, Theresa Krantz; siblings-in-law, Bob Erickson, Scott (Carolyn) Erickson, Brian (Kelly) Erickson, mother-in-law Doris Erickson. He is further survived by nephews, Andrew (Brittany) Kreuser, Mitchell Kreuser, Dane Kreuser; also, lifelong friends Steve (Pam) Grant, David (Patty) Groth, Gary (Mary) Youmans, Rick (Evelyn) Albrecht amongst other relatives and friends.
John is preceded in death by his parents, Donald and Judith (nee Krantz) Kreuser; grandparents Wilfred (Theckla) Kreuser.
John Kreuser was a dedicated, hardworking, and generous man whose curiosity and determination shaped both his professional and personal life. As a husband, he was loyal, loving, and supportive, always putting his family first. As a father, he was patient, protective, and deeply proud, offering guidance, encouragement, and unconditional love. He received his bachelor’s degree in Analytical Chemistry from the University of Wisconsin–Milwaukee. He began his career in that field before transitioning into supply chain management at Bostik, Inc., where he was employed for over 35 years. Throughout his time at Bostik, John developed numerous products and held several patents, a testament to his innovation and expertise.
Beyond his professional achievements, John was deeply engaged in his community and personal passions. He practiced Taekwondo at J.K. Lee, achieving the rank of third-degree black belt. John also dedicated his time to volunteering, often working alongside his children to build homes for Habitat for Humanity.
An entrepreneur at heart, John built side-by-side duplex apartments and a storage units business with his brother, Steve, blending his problem-solving skills with his strong work ethic. He was always planning ten steps ahead, thinking about his family’s future and making sure they were cared for in every possible way. When he wasn’t working, John could often be found spending time outdoors, whether tending to projects in his garage, working in his yard, or camping with his family and friends. He cherished the simple joys of being in nature and sharing those moments with loved ones.
John will be remembered for his work-ethic, kindness, integrity, loyalty, and unwavering love for his family and community. His legacy continues through the lives he touched and the many projects, both personal and professional, that stand as a testament to his life’s work. In his final moments, John said he wouldn’t change a thing.
Mass of Christian Burial will be at 2:00pm on Friday, January 30, 2026, at St. Peter Catholic Church (200 E Washington St. Slinger, WI 53086) with Fr. Richard Stoffel presiding. Visitation will be at church on Friday, January 30th from 11:00am until 1:45pm. Interment will follow mass at the New St. Peter Cemetery in Slinger.
In lieu of flowers, please send donations in John’s name to Habitat for Humanity and St. Peter’s Church.
A special thank you to the nursing staff at West Bend Cancer Care Clinic, Dr. Mandana Kamgar and team at Froedtert Faith Clinic, and Horizon Home Hospice.