Self-help author Mel Robbins greeted fans as she made her way to the stage at Big Night Live in Boston, where 1,300 people gathered for a book club event hosted by Kiss 108's Lisa Donovan.

In 'The Let Them Theory,' Mel Robbins charts a path forward to release what you can't change — and seize what you can.

Author Mel Robbins sits down with Hoda and Jenna to talk about her book “The Let Them Theory” which helps people to feel more freedom and power over their happiness. Robbins is then joined by ...

Mel Robbins, author of ‘The Let Them Theory,’ greeted fans at an event in Boston in January. Photo: Erin Clark/Boston Globe/Getty Images. By . Jeffrey A. Trachtenberg. and .

As Mel Robbins tells it, the concept for her new self-help book, “The Let Them Theory,” came to her on the night of her son Oakley’s junior prom.