Dr. Joseph J. Fins is chief of the division of medical ethics at Weill Cornell Medical College in Ithaca, N.Y., and professor of medicine, public health and medicine in psychiatry. He is also an associate at the Hastings Center. He wrote A Palliative Ethic of Care: Clinical Wisdom at Life’s End.

Nancy Berlinger is deputy director and research scholar at the Hastings Center in Garrison, N.Y., and director of its Guidelines on End of Life Care project. She is the author of After Harm: Medical Error and the Ethics of Forgiveness.

Lucas Silveira, formerly Lilia Silveira, is the lead singer of the rock band The Cliks. He underwent sex-change surgery in 2006. Contact his manager,  Joy Collingbourne.

Renee Richards, the physician and tennis player who was born Richard Raskind, wrote the 2007 book No Way, Renee: The Second Half of My Notorious Life. She lives in New York state. Contact through Simon & Schuster publicity.

Transgender rights advocate Paisley Currah is associate professor of political science at Brooklyn College and co-editor of the book Transgender Rights.

Hudson Kern Reeve is a professor at Cornell University’s department of neurology and behavior.

Philip Kitcher is a philosophy professor at Columbia University in New York City.

Gary W. Fick is professor emeritus of agronomy at Cornell University and author of Food, Farming and Faith.

Joel Berg is author of All You Can Eat: How Hungry is America? and is executive director of the New York City Coalition Against Hunger. His anti-hunger work includes experience with faith-based groups.