text1: "Ken Lewis has now become the lightning rod of controversy, and that is highly distracting," said Jeffrey A. Sonnenfeld, a professor at the Yale School of Management, who believes Mr. Lewis should resign. "Even if everything he did was appropriate, it has hampered his legitimacy to lead." It was not long ago that Mr. Lewis was celebrated for his vision. His daring takeover of Merrill Lynch was the latest in a series of high-profile acquisitions that helped transform Bank of America into a national powerhouse. His conquests included the Countrywide Financial Group, the giant mortgage lender which, for many, came to symbolize the excesses of the subprime era. In December, the American Banker, the daily chronicle of the banking industry, named him 2008 Banker of the Year.
text2: Ken Lewis studied at the Yale School of Management.