Managers To Watch

Keep an eye on Diana D. Brooks, who just took over as president and chief executive of Sotheby's Holdings Inc. The 43-year-old executive is riding a rebound in the auction business. Louis V. Gerstner Jr. had nine months to learn the top job at troubled IBM. The coming year will show whether or not Big Blue's boss can deliver. The stock market is betting "yes." George M.C. Fisher quit his job as chief executive officer of Motorola Inc. to take the helm of struggling Eastman Kodak Co. He was a whiz at Motorola. Can he succeed a second time in a totally different industry?