Mark Steven Bellin, 64, De Pere, passed away Sunday, November 28, 2021 following complications from leukemia treatment. The son of the late Richard and Susanna (DeBruyne) Bellin was born on November 22, 1957. Mark was a graduate of Abbot Pennings High School, Class of 1976, and was most recently employed at Nature's Way in Green Bay. Mark was everyone's Fun Uncle and enjoyed being outside, tending to his garden and riding his bicycle. He loved his music and his cat, Mr. Fish. He is survived by his children, Emma (Zoar) Fulwilder and Sam (Leah) Bellin; and grandchildren, Nico Fulwilder, Medora, Molly and Grace Bellin. Mark is further survived by his siblings, Yvonne (Pat) Hart, John (Sue) Bellin and Jeff (Kathy) Bellin; the Janssen family; many nieces, nephews and extended family. Mark was preceded in death by his parents, Richard and Susanna. Family and friends may visit at Ryan Funeral Home, 305 N. Tenth Street, De Pere, beginning at 10:00 a.m. on Saturday, December 4, 2021. A prayer service will conclude visitation at noon. In lieu of flowers, donations may be made in Mark's honor to the Leukemia & Lymphoma Society at www.lls.org or Kathy's House, a Hospital Guest House in Milwaukee, at www.kathys-house.org. Each of these organizations were extremely helpful and caring in the last six months of Mark's journey.