April 24, 2014 5:52 PM EDT

TIME 100 honoree Natalie Massenet, founder of Net-a-Porter, was asked to reflect on the most influential person in her life.

In addition to her father, Massenet named her “partner-in-crime,” Net-a-Porter CEO Mark Sebba. The two have worked together for the past 10 years.

“He’s taught me about business, about staying calm under fire, and about leadership, and I’m very, very grateful to his influence,” Massanet said.

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