Ralph A. Leonard, age 74 of River Forest; beloved husband of Mary; loving father of Laura (Rob) Luckadoo, Sharon (Jim) Fries, Mark (Vickie) Smith and Angela (Ian) Milstead; adoring grandfather of Nicole, Allison, David, Dylan, Mardi, Haley, Sean and Jake; dear brother Millie (the late Jim) Nash, Marilyn (Ed) Pelton and Carl (Peggy) Leonard; fond uncle of many nieces and nephews. Ralph was a longtime chemical engineer at Argonne National Laboratory. Memorial Service Saturday, Decmeber 17th 2:30 p.m. at the Unitarian – Universalist Church (Unity Temple), 875 Lake St., Oak Park. Interment Private. In lieu of flowers, memorial donations to the Unitarian – Universalist Church of Oak Park are appreciated.