10% Happier with Dan Harris

Joe DiNardo, a businessman and attorney from Buffalo, New York, was married to his wife Marcia for 15 years when she was diagnosed with stage IV pancreatic cancer. DiNardo used to his years of meditation practice to help get through the grief of losing her and in his new book, "A Letter to My Wife," he shares anecdotes about the relationship they had and the love he found.

Bob Thurman, the father of actress Uma Thurman, was one of the first Americans to be ordained as a Tibetan Buddhist monk. He later gave up his robes and is now one of the most famous Buddhist scholars around, having worked with the Dalai Lama for over 50 years and traveled the world lecturing on Buddhist teachings.

John Mulaney, known for his stand-up comedy and his work on "Saturday Night Live," first turned to meditation while filming a short-lived sitcom that bore his name, "Mulaney." He now has a daily meditation practice, which he often practices in a dark dressing room before he goes on stage for "Oh, Hello," the two-man Broadway show he co-wrote and stars in with fellow comedian Nick Kroll.

Jessica Morey, an expert in teaching meditation to teenagers, discusses the transformative effects of meditation retreats for young people and explores the impact of retreats on teenagers. She emphasizes the importance of allowing teenagers to make their own decisions about practicing meditation and highlights the positive effects of meditation on teenagers' mood and self-compassion.

Born and raised in India, Sadhguru says he spent his childhood and adolescence as a "super skeptic" who didn't grow up "with anything spiritual or religious." He spent his days crisscrossing the country on his motorcycle, he launched successful businesses, but then he had an experience in his 20s that changed the direction of his life forever. Sadhguru is now a world renowned yogi and mystic who talks about how ancient yogic practices can be relevant and helpful in contemporary times. He's the founder of the Isha Foundation and the author of "Inner Engineering: A Yogi's Guide to Joy."

Fewer than 50 people have accomplished the Explorer's Grand Slam, a challenge of summiting the highest peaks on each of the seven continents and completing treks to the North and South poles. Colin O'Brady not only completed the EGS this summer, he shattered the world record for it, finishing in just 139 days. O'Brady also set the world record for climbing the seven summits -- summiting Kilimanjaro in just 11.5 hours. Five years ago, a friend suggested he try mediation and recommended a 10-day silent vipassana retreat. At first O'Brady said he looked at meditation like an elite athlete, hoping to train his body and mind for peak performance, but soon discovered meditation gave him a much greater benefit for his daily life.

Duncan Sheik first made a name for himself in the mid-90s with the hit song, "Barely Breathing," and has since reinvented himself as a Broadway composer. He won two Tonys and a Grammy Award for music he composed for the smash Broadway hit, "Spring Awakening," and he also composed music for Broadway's "American Psycho." But when Sheik first started out, performing on stage made him very nervous and it wasn't until he was introduced to Nichiren Buddhism, which involves the practice of a form of mantra meditation, that he got over his fears.

About 20 years ago, Judge Jeremy Fogel was serving as a superior court judge in California. But when he felt that it was causing him a lot of stress, he started looking for a way to center himself, and found meditation and yoga. Shortly after he started practicing, he was nominated to become a federal judge and said meditation became a refuge for him. Today, Judge Fogel continues to practice regularly and touts mindfulness as a powerful tool judges can use to help with their decision-making. He is currently serving as the director of the Federal Judicial Center.

Sebene Selassie's career has taken her all over the world. An Ethiopian immigrant, Selassie grew up in the Washington, D.C., area. Her father left her family in the '70s to go back to Ethiopia and became a guerrilla fighter in the Eritrean independence movement. Her brother became a "Hare Krishna" devotee. Selassie, however, found meditation, and started practicing in high school. She studied Comparative Religious studies at McGill University and went on to work with not-for-profits in international development, including in refugee camps in Guinea. She was a self-professed "really bad dharma student," until she was diagnosed with stage-three breast cancer at age 34. Then she says she became "a really good dharma student." Selassie has now survived breast cancer three times and works as a meditation teacher and transformational coach in New York City.

"Good Morning America" co-anchor Robin Roberts has more than 30 years of experience in the radio and television business and said it was her "GMA" colleagues, George Stephanopoulos and our host Dan Harris, who first perked her interest in meditation a few years ago. Today, she says she can't remember not meditating because it's become so much a part of her daily routine. A devout Christian, Roberts also finds comfort in her faith and has overcome major health challenges, first survived breast cancer and then a battle with a blood and bone marrow disease called myelodysplastic syndrome. She's written about her experiences in her book, "Everybody's Got Something," which is also the name of her new podcast.