Southwest Gas, a $1.8 billion natural gas company, promoted Roy Centrella to CFO and senior vice president. He succeeds George Biehl, who plans to retire later this year. Centrella, 52, most recently served as controller, chief accounting officer and vice president. He joined the Las Vegas-based company in 1983 as a supervisor in accounting. Southwest Gas named Gregory Peterson to succeed Centrella as controller, chief accounting officer and vice president. Peterson, 51, joined the company in 1993 from Arthur Anderson as a supervisor of technical accounting and most recently served as assistant controller.

Associated Banc-Corp., a $1.3 billion bank holding company in Green Bay, Wis., named Christopher Moral-Niles corporate treasurer and executive vice president. He succeeds Lloyd Francis, who left the company. Moral-Niles, 39, joins Associated from First American, where he most recently served as divisional president for First American Trust. Earlier, he served as First American's corporate treasurer and was senior vice president of treasury and director of liability management at Union Bank.

James Shields was named CFO and executive vice president of MoneyGram International, a $1.2 billion payment services company. He succeeds Jeffery Woods, who resigned from the Minneapolis-based company in January for personal reasons. Shields, 47, most recently served as senior vice president of finance and treasurer at Royal Caribbean Cruise Lines. Previously he was treasurer at Celanese Corp. and CFO for consumer markets at Qwest Communications.