Jonathan Haidt is a professor of ethical leadership at New York University’s Stern School of Business. His research interests are morality, emotion, religion and politics. He is the author of The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom and The Righteous Mind: Why Good People Are Divided by Politics and Religion.

Taz Tagore is the author of Seasons of Thanks: Graces and Blessings for Every Home. She is also co-founder of the Reciprocity Foundation, which works with homeless youth in New York.

Brenda Shoshanna is a New York psychologist, Zen practitioner and author of 365 Ways to Give Thanks: One for Every Day of the Year.

Tal Ben-Shahar is the New York-based author of Happier: Learn the Secrets to Daily Joy and Lasting Fulfillment (2007) and has taught a popular introductory positive psychology course at Harvard University.

M.J. Ryan is a consultant and author whose books include Attitudes of Gratitude: How to Give and Receive Joy Every Day of Your Life and A Grateful Heart.

Deborah Norville, anchor of the TV newsmagazine Inside Edition, wrote Thank You Power: Making the Science of Gratitude Work for You (2007), which explores the scientific research behind gratitude.

Louise L. Hay wrote Gratitude: A Way of Life. She is the owner and founder of Hay House, an international mind-body-spirit publisher in Carlsbad, Calif.

Patricia Campbell Carlson is former executive director of A Network for Grateful Living, a Web-based organization that promotes gratitude as a spiritual practice. Carlson lives in Ithaca, N.Y.

Dr. Uma Mysorekar is a former president of the Hindu Temple Society of North America in Flushing, N.Y., and a practicing obstetrician-gynecologist. She has represented Hinduism at interfaith conferences sponsored by the White House. She has written about the Hindu view of gratitude.