Kelly McGonigal is a health psychologist and lecturer at Stanford University in California. She is also a yoga teacher and has written about yoga and gratitude.

Jan St. John is producer and host of Radio Gratitude, a San Francisco based-program that spotlights gratitude and altruism.

Sonja Lyubomirsky is a professor of psychology at University of California, Riverside. She studies human happiness. She has researched the effects of “counting one’s blessings” as a way of enhancing happiness.

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.

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.

Robert Emmons is a psychology professor at the University of California-Davis and director of the Emmons Lab. One of his primary interests is the psychology of gratitude and how gratitude relates to human flourishing. His books include Gratitude Works!: A 21-Day Program for Creating Emotional Prosperity.

The Rev. Kathy Black, a United Methodist minister, is author of A Healing Homiletic: Preaching and Disability and Signs of Solidarity: Ministry With Persons Who Are Deaf, Deafened and Hard of Hearing. She is Kennedy Professor of Homiletics & Liturgics at Claremont School of Theology in California.

W. Daniel Blair is assistant professor of American Sign Language and director of the Center for Deaf Education at California Baptist University in Riverside. His dissertation was about theological education and disability.