She became a national figure as the face of the “Nuns on the Bus.” Sr. Simone Campbell is a lawyer, lobbyist, poet, and Zen contemplative working on issues such as “mending the wealth gap,” “enacting a living wage,” and “crafting a faithful budget that benefits the 100%.” She is a helpful voice for longings so many of us share, across differences, about how to engage with the well-being of our neighbors in this complicated age.

It is a story of our time — the new landscape of living longer, and of dying more slowly too. Jane Gross has explored this as a daughter and as a journalist, and as creator of the New York Times’ “New Old Age” blog. She has grounded advice and practical wisdom about caring for our loved ones and ourselves on the far shore of aging.

What would it take to make our national encounter with gay marriage redemptive rather than divisive? David Blankenhorn and Jonathan Rauch came to the gay marriage debate from very different directions — but with a shared concern about the institution of marriage. Now, they’re pursuing a different way for all of us to grapple with the future of marriage, redefined. They model a fresh way forward as the subject of same-sex marriage is before the Supreme Court.

From the moment of his diagnosis with ALS, Bruce Kramer began writing — openly, deeply, and spiritually — about his struggle, as he puts it, to live while dying. He died on March 23, 2015, while we were in production on this show. His words hold abiding joy and beauty, and reveal an unexpected view opened by this disease.

Alzheimer’s disease has been described as “the great unlearning.” But what does it reveal about the nature of human identity? What remains when memory unravels? Alan Dienstag is a psychologist who has led support groups with early Alzheimer’s patients, as well as a writing group he co-designed with the novelist Don DeLillo. He’s experienced the early stages of Alzheimer’s as a time for giving memories away rather than losing them.

For several hundred years, much of scientific advance has been about exploring human beings, including their actions and choices, in terms of mechanism — our bodies, our brains, physical processes. Research psychologist Michael McCullough believes that understanding our minds as mechanistic creates moral possibility. He’s led groundbreaking studies on the evolution and cultivation of moral behaviors such as forgiveness and gratitude. Arthur Zajonc is a physicist and contemplative, who believes that the farthest frontiers of science are bringing us back to a radical reorientation towards life and the foundations for our moral life.

Eve Ensler has helped women all over the world tell the stories of their lives through the stories of their bodies. Her play, “The Vagina Monologues,” has become a global force in the face of violence against women and girls. But she herself also had a violent childhood. And it turns out that she, like so many Western women, was obsessed by her body and yet not inhabiting it without even knowing she wasn’t inhabiting her body — until she got cancer.

Wisdom for how we can move and heal our society in our time as the Civil Rights Movement galvanized its own. Lucas Johnson is bringing the art and practice of nonviolence into a new century, for new generations. Gwendolyn Zoharah Simmons was an original Black Power feminist and a grassroots leader of the Mississippi Freedom Summer.

In a probing and personal conversation, Reza Aslan opens a refreshing window on religion in the world and Islam in particular. It’s a longer view of history and humanity than news cycles invite — certainly when it comes to the Arab Spring, or to ISIS. His life is a kind of prism on the fluid story of religion in this century. But in a globalized world, we all have a personal stake in how this story unfolds.

Computer scientist Bernard Chazelle has an original take on what music works in us — especially the music of Johann Sebastian Bach. Just as mathematicians talk about discovering rather than inventing great equations, so, he says, Bach set out to “discover” the musical rules behind the universe. After hearing this conversation, you may never listen to any piece of music — whether Bach or Jay-Z — in quite the same way again.

She’s the tattooed, Lutheran pastor of the House for All Sinners and Saints in Denver, a church where a chocolate fountain, a blessing of the bicycles, and serious liturgy come together. She’s a face of the Emerging Church — redefining what church is, with deep reverence for tradition.

For over a decade, the French-American anthropologist Scott Atran has been listening to the hopes and dreams of young people from Indonesia to Egypt. He explores the human dynamics of what we analyze as “breeding grounds for terrorism” — why some young people become susceptible to them and others, in the same circumstances, do not. His work sheds helpful light on the question on so many of our minds as we watch horrific news of the day: How could this happen — and how could we possibly help transform it?

If journalism is a primary way we tell the story of ourselves and our time, Michel Martin is a person helping us tell that story — and take part in it — more completely. Her daily NPR program Tell Me More was often labeled as “diversity” or “minority” programming. But in fact, she and her journalism are about a more generous and realistic sweep of who we are now — and how we’re creating our life together anew. At the Chautauqua Institution, we mine her wisdom on the emerging fabric of human identity.

The third in a four-part series, “The American Consciousness.”

Imani Perry is a scholar of law, culture, race — and hip hop. She acknowledges wise voices who say that we will never get to the promised land of racial equality. She writes, “That may very well be true, but it also true that extraordinary things have happened and keep happening in our history. The question is, how do we prepare for and precipitate them?” We took her up on this emboldening question at the Chautauqua Institution, on the cusp of yet a new collective reckoning with the racial fabric of American life.

The first in a four-part series, “The American Consciousness.”

Dan Barber is a celebrated young chef — but his passionate ethics and intellect have made him much more. He’s out to restore food to its rightful place vis-à-vis our bodies, our ecologies and our economies. And he would do this by resurrecting our natural insistence on flavor.