Michael Sandel teaches political philosophy at Harvard University, where he is the Anne T. and Robert M. Bass Professor of Government Theory. His course “Justice” is the first Harvard course to be made freely available online and on television and has been viewed by tens of millions of people around the world. Full transcript available at: josephnoelwalker.com/michael-sandel

Graham Allison is an American political scientist and the Douglas Dillon Professor of Government Harvard University. Full transcript available at: josephnoelwalker.com/graham-allison

Niall Ferguson is one of the world's most renowned historians. He is the Milbank Family Senior Fellow at the Hoover Institution, Stanford University, and a senior faculty fellow of the Belfer Center for Science and International Affairs at Harvard. He is the author of sixteen books, including most recently Doom: The Politics of Catastrophe. Full transcript available at: josephnoelwalker.com/niall-ferguson

John Hewson is a former Australian politician and was leader of the Liberal Party from 1990 to 1994. Full transcript available at: josephnoelwalker.com/john-hewson See omnystudio.com/listener for privacy information.

John Hewson is a former Australian politician and was leader of the Liberal Party from 1990 to 1994. Full transcript available at: josephnoelwalker.com/john-hewson

John Kay is one of Britain's leading economists.

John Horgan is a science journalist and Director of the Center for Science Writings at the Stevens Institute of Technology, Hoboken, New Jersey. He was senior writer at Scientific American from 1986-1997 and is the author of the bestselling book The End of Science. Full transcript available at: josephnoelwalker.com/horgan See omnystudio.com/listener for privacy information.

John Horgan is a science journalist and Director of the Center for Science Writings at the Stevens Institute of Technology, Hoboken, New Jersey. He was senior writer at Scientific American from 1986-1997 and is the author of the bestselling book The End of Science. Full transcript available at: josephnoelwalker.com/horgan

Graeme Davison is Australia's most eminent urban historian. Full transcript available at: josephnoelwalker.com/graeme-davison

Graeme Davison is Australia's most eminent urban historian. Full transcript available at: josephnoelwalker.com/graeme-davison See omnystudio.com/listener for privacy information.

Cheryl Misak is a Canadian philosopher and the author of Frank Ramsey: A Sheer Excess of Powers. Full transcript available at: josephnoelwalker.com/misak See omnystudio.com/listener for privacy information.

Cheryl Misak is a Canadian philosopher and the author of Frank Ramsey: A Sheer Excess of Powers. Full transcript available at: josephnoelwalker.com/misak

Malcolm Turnbull was the 29th Prime Minister of Australia. Full transcript available at: josephnoelwalker.com/malcolm-turnbull See omnystudio.com/listener for privacy information.

Malcolm Turnbull was the 29th Prime Minister of Australia. Full transcript available at: josephnoelwalker.com/malcolm-turnbull

Andy Lee is one half of iconic Australian comedy duo Hamish & Andy. Full transcript available at: josephnoelwalker.com/andy-lee

Andy Lee is one half of iconic Australian comedy duo Hamish & Andy. Full transcript available at: josephnoelwalker.com/andy-lee See omnystudio.com/listener for privacy information.

Robert Skidelsky, FBA is a British economic historian. He is the author of a three-volume award-winning biography of British economist John Maynard Keynes. Full transcript available at: josephnoelwalker.com/skidelsky

Noam Chomsky is the father of modern linguistics and one of the most cited scholars in modern history. He is also one of the most influential public intellectuals in the world, having written more than 150 books. Full transcript available at: josephnoelwalker.com/chomsky See omnystudio.com/listener for privacy information.

Noam Chomsky is the father of modern linguistics and one of the most cited scholars in modern history. He is also one of the most influential public intellectuals in the world, having written more than 150 books. Full transcript available at: josephnoelwalker.com/chomsky