Ezekiel J. Emanuel, M.D., is vice provost for Global Initiatives at the University of Pennsylvania and a breast oncologist. He is the Diane v.S. Levy and Robert M. Levy University Professor and chair of the Department of Medical Ethics and Health Policy at Penn.

Douglas H. Wheelock has been a NASA astronaut since 1998. He has spent more than 178 days in space, including the STS-120 shuttle mission in 2007 and Expeditions 24 and 25 to the International Space Station in 2010. He is a West Point graduate and a retired U.S. Army colonel. He earned an M.S. in Aerospace Engineering from Georgia Tech University.

Ali Velshi is a journalist, author, and host of “Live with Ali Velshi” on MSNBC. He  has covered a wide range of breaking news events and global affairs throughout his career. He has been honored with a National Headliner Award for Business & Consumer Reporting and has earned two News and Documentary Emmy Award nominations.

Risa Lavizzo-Mourey, M.D., M.B.A., is president emerita and former CEO of the Robert Wood Johnson Foundation, a position she held for nearly 15 years. In March 2017, she was named the Robert Wood Johnson Foundation PIK Professor of Health Policy and Health Equity at the University of Pennsylvania.

Angela Duckworth, Ph.D., is a 2013 MacArthur Fellow and University of Pennsylvania psychology professor. She is also the founder and CEO of Character Lab, which is a nonprofit organization with the mission of advancing scientific insights to help children thrive. She is the author of “Grit: The Power and Passion of Perseverance.”

Dan Gottlieb, Ph.D., is a psychologist and long-time host of “Voices in the Family” on WHYY_FM radio, an award-winning mental health call-in radio show. He has published six books, including the best-seller, “Letters to Sam: A Grandfather’s Lessons on Love, Loss, and the Gifts of Life.”

Kathleen Sebelius served as secretary of the Department of Health and Human Services from April 2009 to June 2014. She served as governor of Kansas from 2003 to 2009. Previous elected offices include two terms as the Kansas insurance commissioner and four terms in the Kansas Legislature.

Kathleen Sebelius served as secretary of the Department of Health and Human Services from April 2009 to June 2014. She served as governor of Kansas from 2003 to 2009. Previous elected offices include two terms as the Kansas insurance commissioner and four terms in the Kansas Legislature.

Aisha Fukushima is a singer, speaker, educator, and “RAPtivist.” She founded RAPtivism (Rap Activism), a hip-hop project spanning 20 countries and four continents, amplifying universal efforts for freedom and justice.

Pam Belluck is a health and science writer for The New York Times. In 2015, she was one of seven Times staffers awarded the Pulitzer Prize for coverage of the Ebola epidemic.

The Rev. Dr. Alyn E. Waller is the senior pastor of Enon Tabernacle Baptist Church in Philadelphia. He is the author of “Enjoy Your Journey: Our Quest for a Deeper Relationship with Christ” and “Hope for the Journey: Believing God is Enough When the Road Gets Rough.”

Aja Graydon and Fatin Dantzler are a married couple who form the Philadelphia-based duo Kindred The Family Soul. Both got their start as teenagers. Fatin produced his first released material with Bell Biv Devoe at 17 and Aja received her first recording contract from Delicious Vinyl at 14.

Sandra Clark is vice president for news and civic dialogue at WHYY-FM. Prior to joining public media, she was a managing editor at The Philadelphia Inquirer, where she rose through a number of editorial positions.

Frederic Bertley, Ph.D., is president and chief executive officer of the Center of Science and Industry, a science museum in Columbus, Ohio.

Vanessa Northington Gamble, M.D., Ph.D., is University Professor of Medical Humanities and Professor of Health Policy and American Studies at the George Washington University.  A physician, scholar, and activist, she is an internationally recognized researcher on the history of American medicine, racial and ethnic inequities in health and health care, and bioethics.

Katherine Napalinga, M.D., is a psychiatrist for Einstein Healthcare Network in Philadelphia.

Karen M. Hudson, Ph.D., M.S.W., L.S.W., is a community relations advisor for Government Affairs, Community Relations, and Advocacy and program leader of the Homeless Health Initiative at Children’s Hospital of Philadelphia.

Stephen Fried is an award-winning journalist and a New York Times bestselling author who teaches at Columbia University and at the University of Pennsylvania.

Paul Offit, M.D., is the director of the Vaccine Education Center at the Children’s Hospital of Philadelphia. He is a pediatrician specializing in infectious diseases and an expert on vaccines, immunology, and virology. He is the co-inventor of a rotavirus vaccine that has been credited with saving hundreds of lives every day.

Walter Tsou, M.D.,  is a nationally known consultant on public health and health care reform and has extensive experience in public health and has lectured widely on public health and health disparities. He is a former Philadelphia health commissioner and a former president of the American Public Health Association. (Part 2)

Walter Tsou, M.D.,  is a nationally known consultant on public health and health care reform and has extensive experience in public health and has lectured widely on public health and health disparities. He is a former Philadelphia health commissioner and a former president of the American Public Health Association. (Part 1)