Niall Booker, group MD and CEO of HSBC North America Holdings Inc., is leaving after 3 decades with the bank;  Irene Dorner will replace him.  Ms. Dorner, the group general manager and president and CEO of HSBC US, will take the new role on 11/1/11.  She'll serve along with Lindsay Gordon as Chief Executives.  Both will report to Stuart Gulliver, CEO of HSBC Holdings Plc, Europe's largest bank. Booker’s career at the HSBC spanned 30 years, including periods in India and the Middle East.  He joined the North American unit, which included the former Household International subprime lender, in 2007 amid an overhaul following soaring bad loan provisions.  He also led the unit during its sale of upstate New York branch network to First Niagara Financial Group Inc. in August for about $1 billion as it pared U.S.  operations. The bank acquired Household, now known as HSBC Finance, for $15.5 billion in 2003.  In 2009, HSBC halted consumer-finance lending at the unit, which has contributed to about $60 billion of provisions in North America, according to data compiled by Bloomberg. [Bloomberg, 10/7/11]