It was a curious fact that when billionaire Michael Bloomberg was mayor of New York City for 12 years, he had complete control of the public schools yet did not have any fresh ideas about how to improve them.

This should not be surprising, because he was never an educator. He hired another non-educator–Joel Klein–to be his chancellor. The two of them relied heavily on McKinsey and other consultants to guide them. They hired lots of MBAs to staff top  positions. They hoped to adopt a corporate style of organization, which made sense because they had low regard for actual educators.

He adopted every aspect of No Child Left Behind: high-stakes testing, closing schools, firing teachers and principals. He loved opening small schools, and when they failed, he reopened them with a new name so they could start over.

New York City was a faithful replication of NCLB, with punishments and rewards leading the way.

His main idea was to hand schools over to private charter operators, assuming that they would have better ideas about how to run schools than he did.

Some of the charter operators made a point of excluding low-performing students, which artificially boosted their test scores.

Some closed their enrollments in the fourth grade, so they would not have to take in new students after that point.

Some kicked out kids who were in need of special services.

Bloomberg’s favorite charter chain was Eva Moskowitz’s Success Academy, which used all of these tricks to get astonishingly high test scores.

Bloomberg was obsessed with data and test scores. He even adopted Jeb Bush’s policy of letter grades for schools (which his successor Bill DeBlasio abolished).

The New York City charter industry practiced all the tricks of raising test scores by manipulating the student population.

In addition, the charter sector mastered the ability to organize mass rallies, flooding legislative halls with students and parents, pleading for more funding for new charters (which they could not attend since they were already enrolled in charters).

So pleased was Bloomberg with his charter policy that it is now the centerpiece of his national education agenda.

He doesn’t care about the nearly 90% of kids who are enrolled in public schools.

He believes in privatization.

If elected, he could retain Betsy DeVos as his Secretary of Education and maintain continuity with Trump’s education agenda.