Timothy Greenfield-Sanders / Courtesy of HBO

Timothy Greenfield-Sanders spoke to TIME about his new film, About Face: Supermodels Then and Now (HBO), which explores how aging has influenced some of history’s most famous models.

How did you get a bunch of supermodels to talk about aging?
It was a matter of trust, and a lot of them were at a point in their lives that they were ready to be open. It wasn’t easy but that’s what I do for a living — I put people in front of a camera and make them feel comfortable.

Read the interview on TIME Style & Design here.