New York Stock Exchange.

William H. Donaldson, 68, was named chairman, president, and chief executive of Hartford, CT-based Aetna, a $26.5 billion health insurer. Donaldson, co-founder of Donaldson, Lufkin & Jenrette and immediate past chairman and CEO of the New York Stock Exchange, replaces Richard L. Huber, 63, who resigned.

* John Reed, 61, announced that he would retire from his post as chairman and co-chief executive of Citigroup, a financial services firm which was formed by the 1998 merger of Citicorp and Travelers Group. Reed's retirement leaves Sanford Weill, 67, as chief executive.

* Dennis H. Reilley, 46, was named president and chief executive of Danbury, CT-based Praxair, a $4.6 billion industrial gases company. Reilley, formerly executive vice president and chief operating officer of Dupont, succeeds William Lichtenberger, 64, who will remain chairman until his retirement in November. At that time, Reilley will assume the additional title of chairman.

* Leo Hindery was named chief executive of Beverly Hills, CA-based Global Crossing, a $1.66 billion telecommunications company. Hindery, a former AT&T Corp. executive who joined Global Crossing in December to head GlobalCenter, the Global Crossing subsidiary that provides Web hosting and Internet infrastructure services, succeeds Bob Annunziata, who will serve on Global Crossing's board of directors.

* James Rohr, 51, was named chief executive, effective May 1, of Pittsburgh, PA-based PNC Bank Corp., a bank holding company with $75 billion in assets. Rohr, currently president and chief operating officer, will succeed Thomas H. O'Brien, 63, who will stay on as chairman for another year, at which point Rohr will take over.

* Jeanne Jackson, 48, was named chief executive of Palo Alto-based Wal-Mart.com, the new independent company and Internet presence of the Wal-Mart retail chain. Jackson is formerly chief executive of the Banana Republic division of Gap, Inc.

* Mark Anderson was named president and chief executive of Fargo, ND-based Community First Bankshares, a $6.3 billion multi-bank holding company. Anderson, who had served as vice chairman of corporate services as well as chief financial officer and chief information officer, succeeds Don Mengedoth, who will continue to serve as chairman.

* Jim Taylor, 55, was named chief executive of Huntsville, AL-based Intergraph Corporation, a $938 million computer graphics software company. Taylor, most recently head of Intergraph's public safety business unit, succeeds founder Jim Meadlock, 66, who will continue as chairman.

* Dennis Madsen, 51, was named president and chief executive of Kent, WA-based Recreational Equipment, a $587 million outdoor equipment retailer. Madsen, who had been chief operating officer and executive vice president, succeeds Wally Smith, who had held the post for 17 years.

* David D. Olson, 44, was named to the new position of chairman and chief executive of DLJ Asia, the Hong Kong-based affiliate of Donaldson, Lufkin & Jenrette, an integrated investment and merchant bank. Olson was previously co-head of DLJ's investment banking office in Chicago.

* Bud Johnson was named chief executive of New York City-based FAO Schwarz, a specialty toy retailer and division of Netherlands-based Vendex KBB. Johnson, who had served as president and chief operating officer, replaces John Elyer, who left the company in January to become president and chief executive of Toys R Us.

* Dennis L. Herrick was named chief executive of American Fork, UT-based Sento Corporation, a technical services provider. Herrick, most recently chief operating officer and founder of Triptych CD, succeeds Arthur F. Coombs, who will become chief executive of EchoPass Corporation, a Sento partner.