The $5.7 billion, broker of exchange-listed futures and options, MF Global Ltd., based in New York, has named chief administrative officer, Ira Polk, as interim CFO. Polk, 60, replaces Amy Butte, who left the company to pursue other opportunities. Polk, has spent 22 years with MF Global, formerly Man Financial, including seven years as CFO. Before2 coming to Man Financial in 1985, he served as vice president of finance and administration at Rudolf Wolff & Co. For the previous three years, he assumed the role of vice president of finance at Johnson Matthey & Wallace Inc. From 1973 to 1982, Polk was a principal q5 the accounting firm of Arthur Young & Co.

Blue Cross and Blue Shield of Minnesota named Michael Morrow CFO of the $1.4 billion health plan, the largest in Minnesota. The health insurance carrier is based in Eagan, Minn. Morrow, 50, succeeds Timothy Peterson, who retired. Morrow's career with the company spans over two decades. He has held various positions with the health plan provider since 1985, including vice president of financial planning, vice president of network operations and director of provider contracting and payment.

The $743 million provider of automation solutions and integrated subsystems, Brooks Automation Inc., with headquarters in Chelmsford, Mass., named senior vice president and corporate controller, Richard Small, interim CFO. Small, 50, succeeds Robert Woodbury, who has resigned from his post. Since joining Brooks in September 2003, Small has served as corporate controller and most recently as senior vice president and principal accounting officer. Before joining the company, he spent six years with Global Knowledge Network, where he assumed the role of corporate controller for five years. Prior to 1997, Small served as operations controller for Helix Technology Corp. and worked in corporate accounting and financial management at Bolt Beranek and Newman and in program accounting and administration at Lockheed Sanders.