December 27, 2015
Journalist A.J. Jacobs; poet Rives; neuroscientist Sophie Scott; and Norwegian television producer Thomas Hellum.
December 20, 2015
Photography is discussed.
December 13, 2015
Journalist Jamie Bartlett; journalist Jason Pontin; author John Green ("The Fault in Our Stars"); documentarian Jon Ronson
December 6, 2015
Computer vision expert Abe Davis; computer exper Fei-Fei Li; philosopher Nick Bostrom; and Google's Sergey Brin.
November 29, 2015
David Rothkopf (Carnegie Endowment for International Peace); political theorist Ivan Krastev; law professor Lawrence Lessig; and economist Mariana Mazzucato.
November 22, 2015
Bioligist E.O. Wilson; artist-educator Heather Barnett; physicist Michael Nielsen; and biologist Uri Alon.
November 15, 2015
Yachtswoman Ellen MacArthur; Billie Jean King; UN Women director Elizabeth Nyamayaro; and businesswoman Stephanie Shirley.
November 8, 2015
StoryCorps founder Dave Isay; Vincent Cochetel, the director of the Bureau for Europe at the United Nations High Commissioner for Refugees; World Access for the Blind president Daniel Kish; and author-illustrator Jarrett J. Krosoczka.
November 1, 2015
Infographics expert Manuel Lima; historian Yuval Noah Harari; moral philosopher James Flynn; and artist Raghava KK.
October 25, 2015
Meu Rio founder Alessandra Orofino; architect Mark Raymond; security researcher Robert Muggah; and architect Takaharu Tezuka.
October 18, 2015
Plant geneticist Pamela Ronald; Rose Goslinga, a crop insurance saleswoman in Africa; ecologist Jonathan Foley; and Green Bronx Machine founder Stephen Ritz.
October 11, 2015
Rev. James Forbes; Rabbi Jackie Tabick; Buddhist scholar Robert Thurman; and researcher Daniele Quercia.
October 4, 2015
Documentary filmmaker Jon Ronson; sociologist Zeynep Tufekci; journalist Bruno Torturra; and Margaret Gould Stewart, Facebook's director of product design.
March 16, 2015
Financial expert Mellody Hobson; poet Clint Smith; poet Jamila Lyiscott; human-rights attorney Kimberley Motley; and Sarah Jones.
March 15, 2015
Speech scientist Rupal Patel; data analyst Susan Etlinger; Kenneth Cukier; and Enlitic CEO Jeremy Howard.
March 14, 2015
Science historian Laurel Braitman; California Highway Patrol officer Kevin Briggs; violinist Ji-Hae Park; Ruby Wax; and John Legend.
March 13, 2015
Writer Isabel Allende; philosopher Ruth Chang; Leading Women CEO Susan Colantuono; and sociologist Brené Brown.
March 12, 2015
Georgetown Climate Center executive director Vicki Arroyo; climate scientist James Hansen; economist Nicholas Stern; and climate scientist Gavin Schmidt.
March 11, 2015
Investigative journalist Will Potter; former White House deputy chief technology officer Beth Noveck; Citizen University founder Eric Liu; and venture capitalist Nick Hanauer.
March 10, 2015
Sting; Tom Thum; Mark Ronson; and Ryan Holladay.
March 9, 2015
Risk economist Didier Sornette; marketing strategist John Gerzema; business consultant Philip Evans; and economist Robert Gordon.
March 8, 2015
Travel journalist Holly Morris; nuclear scientist Taylor Wilson; physicist Michel Laberge; and physician Irwin Redlener.
March 7, 2015
Journalist Amanda Bennett; anthropologist Kelli Swazey; end-of-life planner Judy MacDonald Johnston; philosopher Stephen Cave; and filmmaker Cesar Kuriyama.
March 6, 2015
Computer scientist Lorrie Faith Cranor; economist Marco Annunziata; digital artist-designer Jer Thorp; and Seth Priebatsch, creator of SCVNGR and LevelUp social gaming sites.
March 5, 2015
Urban planner Toni Griffin; city planner Amanda Burden; architect Diébédo Francis Kéré; and MIT Media Lab's Kent Larson.
March 4, 2015
Geneticist Wendy Chung; regenerative-medicine expert Molly Stevens; philosopher Thomas Pogge; and financial management expert Roger Stein.
March 3, 2015
International-affairs expert Anne-Marie Slaughter; Facebook COO Sheryl Sandberg; Dr. Paula Johnson; and Futures Without Violence founder Esta Soler.
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