Powerful Bank Regulator to Retire

``Julie Williams, the chief counsel of the Office of the Comptroller of the Currency, announced on Monday that she would leave the agency on Sept. 30. Ms. Williams, who also twice served as acting comptroller, said she would officially retire at the end of the year. Working behind the scenes in Washington, Ms. Williams was intrinsically linked to the agency. A skilled lawyer with a mastery of esoteric financial minutiae, Ms. Williams positioned herself as the go-to adviser. In recent months, she has led the agency's effort to write new rules for Wall Street and played a role in dissecting the multibillion-dollar trading loss at JPMorgan Chase.''