Leonard J. Graf, age 89, of Northbrook, formerly of Skokie, died April 18, 2020 at the Northbrook Inn, Northbrook, IL. He was born October 1, 1930 in Chicago, IL to Leonard and Phyllis Jones Graf. He served in the U.S. Navy during the Korean War. He was a member of the Knights of Columbus. He retired as an Executive Construction Manager in the construction industry. Beloved husband of the late Jacqueline, nee O’Leary; dear father of Mary (Edmund) Mahoney and the late Thomas (Ruth); and loving grandfather of Michael Graf, Joseph, Matthew and Mark Mahoney. A Memorial Mass at St. Peter Catholic Church, Skokie, will be held in the future. Memorial contributions may be made to Catholic Charities, 721 N. LaSalle St., Chicago, IL, 60654.