David J. Niesen, Sr., died peacefully on October 15, 2018, while enjoying a Monday night Packer game, surrounded by his family. He was born on November 14, 1954, to Clarence R. and Christine M. Niesen in South Milwaukee. Dave spent his early life in South Milwaukee and Oak Creek, working as an Iron Worker with his brothers of the IW Local 8. After an injury on the job, he went back to school at the Milwaukee School of Engineering and earned his engineering degree. Dave later relocated to the Neenah area, where he worked for P.H. Glatfelter and then AZCO, Inc., where he remained until his retirement in 2009. In 2016, he purchased a winter home in Florida, to be near his daughter and enjoy the snowbird lifestyle. Dave was an avid outdoorsman, enjoying hunting and fishing around his cabin in Adams County with his sons and many friends. He also enjoyed riding his Harleys with friends, enjoying rides and rallies near and far. Dave is survived by his fiancée, Gail Flanigan, of Tomahawk; his daughter, Carrie (Frank) Leontitsis, of Punta Gorda, FL; his sons, DJ Jr. (Emily) of Neenah; Steven (Rebecca) of Winneconne; his beloved grandchildren, Alexander, Channing, Emma, and Letty; and his brothers, Daniel and Clarence and their families; along with many cherished friends and colleagues. He was preceded in death by his parents; and his sister, Mary Christine. A visitation for family and friends will be on Saturday, October 27, 2018, from 11:00 a.m. to 1:00 p.m. at Mueller Funeral Home 904 E. Main St. Winneconne. A service will be held on Saturday at 1:00 p.m. at the funeral home. A Celebration of Life will take place on Saturday starting at 2:30 p.m. at The Hill Tavern 8069 Cty Rd D Omro. In lieu of flowers, memorial donations may be made to the New Chester Volunteer Fire Department, at 629 Mason St., Grand Marsh, WI 53936. If you wish please submit online condolences to muellerfuneralhomeinc.com.