Dr. Marc Schulz is the author New York Times bestseller The Good Life and associate director of the Harvard Study of Adult Development, the longest scientific study of happiness ever conducted.

Since 1938, this study has tracked three generations of families to uncover what contributed to their happiness surrounding relationships, money, success and what really leads to a happy life. The simple but surprising answer is: relationships. The stronger our relationships, the more likely we are to live happy, satisfying, and overall healthier lives.

Today, Marc helps us understand how relationships in all their forms—friendships, romantic partnerships, families, coworkers, tennis partners, book club members, Bible study groups—all contribute to a happier, healthier life.

My friends, in a world faced with unprecedented levels of unhappiness and loneliness, Marc empowers us through actionable guidance that it's never too late to strengthen the relationships you have, and never too late to build new ones.