Who became leader of education reform?

There's no single person who became the universally recognized "leader of education reform." Education reform is a complex and ongoing process with many different leaders and approaches at various levels (local, state, national, international). Different people take on leadership roles depending on the specific reform initiatives and geographic location.

For example, you might be thinking of individuals like:

* Arne Duncan: Served as U.S. Secretary of Education under President Obama and was a prominent figure in education reform efforts during that time. His focus included promoting charter schools and standardized testing.

* Michelle Rhee: Former chancellor of the Washington, D.C., public school system, known for her aggressive reform strategies including teacher evaluations and school closures.

* Joel Klein: Former chancellor of the New York City public school system, also known for his ambitious reform agenda.

These are just a few examples, and their impact and legacy are subjects of ongoing debate. Many other individuals at local and state levels have played significant roles in driving education reform initiatives. The question of who is the *leader* depends heavily on the specific context and timeframe you are considering.