Dr. Mona Hanna

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This week’s guest is someone whose courage changed the course of a city — and, in many ways, a nation. Dr. Mona Hanna is a pediatrician, author, and public-health visionary from Flint, Michigan — the doctor who refused to look away when something invisible was hurting children.

You remember the story:

Flint’s water changed, and so did the lives of thousands of families.

While officials denied, delayed, and deflected, Dr. Mona did what good doctors — and great leaders — do.

She listened.

She tested.

She told the truth.

And when the truth was uncomfortable, she spoke it louder.

Her research proved what parents had feared — that the water flowing into their homes was poisoned with lead.

Her willingness to step into the storm saved lives and forced accountability.

For that, TIME named her one of the 100 Most Influential People in the World.