04 Apr 2008, Alexander Campbell, Risk magazine
MacDonald replaces interim CFO Ira Polk, who continues to serve as chief administrative officer. Polk stepped in after the resignation in January of the former CFO, Amy Butte.
MacDonald was previously CFO and treasurer at TD Ameritrade, becoming chief operating officer in 2006.
MF Global's internal controls were called into question earlier this year when a single broker, trading on his own account, made unauthorised losing trades in wheat futures that left the company to cover his $141.5 million losses.