Transitions.

Derek Burney, 37, was named interim president and chief executive of Ottawa, Canada-based Corel Corp., a $243 million developer of business productivity, graphics, and operating solutions for various platforms. Burney, the company's executive VP and chief technology officer, steps in following the resignation of Dr. Michael Cowpland, who will serve as a director and technology advisor.

* John Garrison, 40, was named chairman and chief executive of Houston, TX-based Azurix Corp., a $618 million provider of wastewater related services and developer of water resources. Garrison, the company's president and COO, succeeds Rebecca Mark, who has resigned to pursue opportunites as a private investor in the water resources business.

* Sanjay Kumar, 38, was named chief executive of Islandia, NY-based Computer Associates International, a $6 billion provider of end-to-end infrastructure to enable e-business. Kumar, the company's president and COO, succeeds founder Charles Wang, who will focus on developing new ventures in his role as chairman.

* Tokjoo (T.J.) Lee, 51, was named president and chief executive of Glenview, IL-based Zenith Electronics Corp., an $834 million manufacturer of electronic entertainment products. Lee, most recently the president of a joint venture between LG Electronics and IBM called LG-IBM, succeeds Ian Woods, who plans to retire after a brief transition period.

* Michael Lockhart, 51, was named chairman and chief executive of Lancaster, PA-based Armstrong Holdings, a $3.4 billion floor and ceiling manufacturer. Lockhart, the former chairman and chief executive of General Signal Corp., succeeds George Lorch, who was named chairman emeritus in recognition of his contributions.

* Kenneth Lowe, 50, was named president and chief executive of Cincinnati, OH-based The E.W. Scripps Co., a $1.6 billion diversified media company. Lowe, previously the chairman and chief executive of Scripps Networks, succeeds William Burleigh, who remains chairman.

* Blake Nordstrom, 39, was named president and Bruce Nordstrom, 66, was named chairman of Seattle, WA-based Nordstrom, a $5.1 billion specialty retailer. The Nordstroms step in following the resignation of John Whitacre, who abdicated his post following a decline in company performance over the past several years.

* Richard Notebaert, 53, was named president and chief executive of Lisle, IL-based Tellabs, a $2.3 billion marketer and manufacturer of optical networking, next-generation switching, and broadband access solutions. Notebaert, the former chairman and chief executive of Ameritech, succeeds company co-founder Michael Birck, who was named the chairman.

* Ross Perot Jr., 41, was named president and chief executive of Dallas, TX-based Perot Systems, a $1.1 billion provider of information technology services and business solutions. Perot Jr., who has served as a board member since 1988, succeeds Ross Perot Sr., who will remain chairman.

* Joe Ricketts, 58, was named interim chief executive of Omaha, NE-based, Ameritrade, a $268 million online broker. Ricketts, the company's chairman and founder, steps in following the abrupt resignation of Tom Lewis, who cited "personal reasons" for his departure after two months in the post.

* Peter K. Scaturro, 40, was named chief executive of The Citibank Private Bank, a division of Citigroup with $149 billion in client business. Scaturro, Citigroup's managing director and head of the U.S. Private Banking business for Citibank, succeeds Todd Thomson, who was promoted to CFO of Citigroup.