H&R Block, the $3.9 billion tax service provider, named Jeffrey Brown CFO and senior vice president. Brown has served as acting CFO since Becky Shulman left the Kansas City, Mo.-based company at the end of April. Brown, 51, had been H&R Block's corporate controller since 2008. Earlier, he was assistant controller of a subsidiary, H&R Block Management, and before that was director of that unit's corporate accounting. Brown previously served as controller at Bacou-Dalloz.

Nalco, a $3.7 billion water treatment company in Naperville, Ill., named Kathryn Mikells CFO and executive vice president. She replaces Brad Bell, who is retiring. Mikells, 44, is currently CFO of UAL Corp., the parent of United Airlines, and will begin her new job when United's merger with Continental is final. Before being named CFO of UAL in 2008, Mikells served as vice president of investor relations for United and before that as treasurer. She joined United in 1994 as a financial analyst.

Brinker International, the $2.9 billion operator and franchiser of chain restaurants including Chili's Grill & Bar and Maggiano's Little Italy, named Guy Constant CFO and executive vice president. He replaces Charles Sonsteby, who left to become CFO of Michaels Stores. Constant, 45, had been the Dallas, Texas-based company's senior vice president of finance and CFO of Chili's. Since joining Brinker in 2004, Constant has worked in finance, compensation and investor relations.