They include Charles H. Noski , the former chief financial officer of AT & T ; Donald T. Nicolaisen , a former chief accountant at the Securities and Exchange Commission ; Hutham Olayan , the president of the American arm of the Olayan Group , a company with extensive investments in Saudi Arabia and elsewhere in the Middle East ; and Erskine B. Bowles , a fellow North Carolinian who also served Mr. Mack as an advisory director at Credit Suisse and is a former chief of staff in the Clinton administration .