Brussels - Belgium's former Prime Minister Jean-Luc Dehaene is to head the board of the struggling Franco-Belgian financial service group Dexia, Belgium's Prime Minister Yves Leterme announced Tuesday after an overnight crisis meeting in Brussels.

French banker and BNP Paribas executive Pierre Mariani is to serve as as chief executive. Mariani is currently a senior executive vice president at France's largest bank, BNP Paribas, France's largest bank.