Leonie Haimson is Néw York City’s one-person Truth Squad.

While Schools Chancellor Dennis Walcott was telling anyone who would listen about the stellar education record of the Bloomberg years, Haimson marshaled data to demonstrate that New York City made less academic progress on the federal tests than any city other than Cleveland.

She lacerated the administration for its indifference to class size, now at its highest point in 14 years.

And she shocked her Bronx audience by explaining that the city was releasing confidential student data without parental consent to inBloom, to be mined by vendors.

Haimson is the leader of Class Size Matters and a co-founder of Parents Across America. She is also a director of the Network for Public Education.