In an opinion piece titled “The Trouble with Tenure,” New York Times columnist Frank Bruni talked with Colorado’s loudest champion of education reform about teacher tenure and the role of unions.

Bruni praised Johnston’s approach, which focuses on overhauling teaching, saying it was rooted in optimism and “reverence” for teaching.

Johnston was a key player in a suite of reforms that implemented a new system of teacher evaluations and abolished teacher tenure in Colorado. Aspects of those reforms are currently in the midst of ongoing legal battles but Johnston has defended the potential of the legislation to improve public education.

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Note: this article has been edited for clarity.