Barbara J. McClure is an associate professor of pastoral theology at Brite Divinity School in Fort Worth, Texas. Her interests include human flourishing and spiritual formation, and she has worked as a pastoral counselor. She can speak to the idea of gratitude and human flourishing.

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.