Jeffrey "Jeff" Paul Dorn, 56, De Pere, passed away Tuesday morning, April 22, 2025, surrounded by his three girls.

Jeff was diagnosed with Leukemia in April of 2022. He received a bone marrow transplant on August 9, 2022. Jeff struggled with severe chronic graft versus Host Disease (GVHD) and battled as best he could. For more information on chronic GVHD go to https://www.lls.org/treatment/types-treatment/stem-cell-transplantation/graft-versus-host-disease

He was born in Green Bay on December 25, 1968, to Roger and Barbara (MacKenzie) Dorn.

Jeff graduated from West De Pere High School in 1987. On May 4, 1996, at Old St. Joseph Church in De Pere, he married his wife of 28 years, Mary (Sinclair) Dorn.

He worked for many years at JX Enterprises as a Warranty Administrator.

Jeff could make any project happen. He contracted the family home, built an inground pool, and spent countless hours tinkering in his garage. Floating in the pool with a Corona was his favorite summer past time.

He is survived by his wife Mary, daughters Alison (Jon Lemens) Dorn, and Emily (Ethan Williams) Dorn. Mother-in-law Lynn Sinclair, his mother Barbara Dorn. Siblings; Erin Long, Michelle (Rick) Baugnet, and Erik Dorn. Brother-in-law; Butch (Laura) Sinclair, as well as aunts, uncles, cousins, nieces, nephews and great nieces and nephews.

Jeff was preceded in death by his father Roger Dorn, father-in-law Bernie Sinclair, his aunt and Godmother Ardie Robertson, and other extended family.

Friends may call at Ryan Funeral Home 305 N. Tenth Street, De Pere from 5:00PM – 7:00PM Thursday, May 1, 2025. Visitation will continue Friday at Our Lady of Lourdes Catholic Church 1305 Lourdes Ave., De Pere from 9:00AM – 10:15AM. Mass of Christian Burial will be celebrated at 10:30AM with Fr. James Baraniak O.Praem. officiating.

Special thanks to the medical team at Froedtert Grace Clinic, especially Dr. Lyndsey Runaas and the procedure area nurses; Dom, Jess, Katie, Val, Karen, and Tina.