He has since been appointed to become the next president of the Peterson Institute for International Economics.
Sir Mervyn King, governor of the Bank of England, said: “I congratulate Adam on his appointment to lead the highly respected and admired Peterson Institute.
“On behalf of the Bank, I want to thank Adam for his outstanding contribution to the MPC over the past three years and wish him well in his new role.”
Posen said: “I am deeply grateful to the superb staff of the Bank of England, to the governor and all of my colleagues on the MPC, and to Her Majesty's Treasury for enabling me to make a contribution to British monetary policy during this difficult and challenging period.
“I am proud of the work we have done trying to understand and stabilize UK economic performance in the aftermath of the global crisis.
“I also am sincerely grateful to the many people from all areas of the United Kingdom who engaged with me openly and frankly during my travels for the MPC."