Bill Bratton, NYPD’s champion of ‘broken windows’ policing, retires Friday

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NEW YORK — William Bratton is at the end of an unparalleled law enforcement career that saw him run police departments in Boston, Los Angeles and New York and advocate crime fighting strategies that were copied across the nation.

The 68 year old is due to step down Friday after three years in his second stint as New York's police commissioner to take a job as a private security executive.

"Public safety is a shared responsibility, but police will always carry the larger burden," Bratton wrote in an official retirement letter to Mayor Bill de Blasio. "It is impossible to quantify the many acts of bravery, kindness, and concern that our officers perform each day, but I am deeply grateful for their acts and for the privilege of working beside them for the past 33 months."

Bratton became known for mining crime data to deploy his forces. He also cracked down on smaller offenses to discourage larger ones — an approach known as "broken windows."

A recent inspector general's report rankled Bratton by finding no correlation between broken windows and dramatic drops in crime in New York.

Bratton struck back last week by suggesting the report was the work of "amateurs."

NYPD Chief of Department Jimmy O'Neill will be stepping up and filling the role of commissioner.