Dan Harris is co-anchor of “Nightline” and the weekend edition of “Good Morning America” on ABC News. He also regularly files reports for “World News Tonight with David Muir,” “20/20,” “Good Morning America,” ABC News Digital and ABC News Radio. Previously, he anchored “World News Sunday.”

In 2014, Harris published the book, “10% Happier: How I Tamed the Voice in My Head, Reduced Stress without Losing My Edge and Found Self-Help That Actually Works.” It went to #1 on the New York Times Bestsellers List, and then became an app, designed to teach meditation to skeptics, and this podcast, where Harris talks with smart people about whether there’s anything beyond 10 percent.