from Babylon 5 Don Ohl, 5-time All-Star for three NBA teams Don Ohlmeyer, Emmy and Peabody Award-winning television producer, Monday Night Football, Saturday Night Live Jahlil Okafor, basketball player for Duke and Philadelphia 76ers, third pick of 2015 NBA draft Georgia O'Keeffe, artist, Art Institute of Chicago student (born in Wisconsin) Ol–Oz Douglas R. Oberhelman, CEO of Caterpillar Inc. Ed Olczyk, player for six NHL teams, coach, TV commentator Claes Oldenburg, sculptor Brian Oldfield, shot putter Jawann Oldham, center for eight NBA teams Catherine O'Leary, said to be indirectly responsible for Great Chicago Fire Charley O'Leary, oldest MLB player (58) ever to bat Matt O'Leary, actor John M. Olin, owner of 1974 Kentucky Derby winner Cannonade Ken Olin, actor, director, producer, Thirtysomething, Brothers & Sisters Gene Oliver, catcher for five MLB teams Guy Oliver, silent-film actor King Oliver, jazz musician (born in Louisiana) Martha Capps Oliver, poet, hymnwriter Gertrude Olmstead, silent-film actress James Olson, actor, The Andromeda Strain, Rachel, Rachel, Ragtime Francis O'Neill, Chicago chief of police 1901–05 (born in Ireland) Kyle Onstott, author, Mandingo Jerry Orbach, film, TV and Tony-winning stage actor, Law & Order, Prince of the City, Dirty Dancing, Beauty and the Beast Dick Orkin, radio personality Suze Orman, author, financial advisor, television commentator Red Ormsby, Major League Baseball umpire 1923–41 Carey Orr, cartoonist David Orr, alderman, Cook County clerk, briefly Mayor of Chicago Johnny Orr, basketball coach, University of Michigan and Iowa State Warren H. Orr, judge (born in Missouri) Zak Orth, actor, Revolution Kid Ory, musician and bandleader (born in Louisiana) Harold Osborn, athlete, gold medalist in decathlon and high jump at 1924 Summer Olympics Dan Osinski, MLB pitcher 1962–70 Wally Osterkorn, pro basketball player Fritz Ostermueller, MLB pitcher 1934–48 Johnny Ostrowski, MLB player for Cubs and White Sox Jim O'Toole, MLB pitcher 1958–67 Dave Otto, MLB player, sportscaster Diana Oughton, student activist, member of The Weathermen Antoine Ouilmette, early settler, Wilmette named for him (born in Canada) Michael Ovitz, co-founder of Creative Artists Agency, president of Walt Disney Company 1995–97 Ruth Bryan Owen, first female in Florida elected to U.S. Congress; ambassador to Denmark and Iceland Brick Owens, MLB umpire 1908–37 (born in Wisconsin) Joseph W. Ozbourn, decorated World War II soldier Marite Ozers, 1963 Miss USA (born in Latvia) P Pa–Pd Geraldine Page, Oscar-winning actress, The Trip to Bountiful, Hondo, Sweet Bird of Youth (born in Missouri) Harlan Page, two-sport star for University