The “All About Mary” page at the University of Dayton in Ohio, a Marianist Catholic college, is the portal to the Marian Library/International Marian Research Institute, one of the largest collections of resources on the Virgin Mary in the world.

Philip Watkins teaches psychology at Eastern Washington University in Cheney. He specializes in gratitude and has researched its relationship to spirituality.

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.

Jo-Ann Tsang is an associate professor in the department of psychology and neuroscience at Baylor University in Waco, Texas. She has researched gratitude extensively.

Edward J. Harpham is a professor of political science at the University of Texas at Dallas. As a political theorist, he focuses on the role of philosophical ideas in the liberal political tradition and in American government. He has written about gratitude within the history of ideas and in the work of the political economist Adam […]

Dan P. McAdams is a professor of psychology and director of the Foley Center for the Study of Lives at Northwestern University in Evanston, Ill. McAdams’ research examines how people develop their identities, and he has studied “generativity,” adults’ concern for the next generation. His book The Redemptive Self: Stories Americans Live By, which finds personal redemption a major […]

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.

Lamin Sanneh is the D. Willis James Professor of Missions and World Christianity at Yale University. He wrote the entry “Gratitude and Ingratitude” in the Encyclopaedia of the Qur’ān.

Robert C. Roberts is a professor of ethics at Baylor University. He specializes in virtues and emotions and wrote the entry on gratitude in New Dictionary of Christian Ethics & Pastoral Theology.