Mikells was CFO of ADT. She also has served as CFO at Nalco Holding and UAL.
Gamble serves as executive vice president and CFO of Lexmark International.
Donargo served as CFO and treasurer at competitor BrightPoint before the company was acquired by Ingram Micro.
Aiken, who will take over in January, is senior vice president and CFO of Gulfstream Aerospace, a unit of General Dynamics.
Cooper was CFO of Westell Technologies. He is taking over at Federal Signal from the interim CFO.
Seaton was the company's senior vice president of finance.