Tom Rath is an American author and a consultant on employee engagement, strengths, and well-being.

Sonia Purnell is a British writer and journalist who has worked at The Economist, The Daily Telegraph, and The Sunday Times.

Alexander Hamilton was one of the Founding Fathers of the United States, an instrumental promoter of the U.S. Constitution, and founder of the nation's financial system. He co-wrote the 85 Federalist Papers essays (under the pseudonym "Publius") with James Madison and John Jay between October 1787 and May 1788, and published early political writings including *A Full Vindication of the Measures of Congress* and *The Farmer Refuted*.

Charles Aronstein, who wrote under the pen name James Madison, was an American theatre manager, writer and publisher, responsible for writing and publishing the periodical Madison's Budget..

Adam Smith was a Scottish economist and philosopher who was a pioneer in the field of political economy and key figure during the Scottish Enlightenment.

Michael Monroe Lewis is an American author and financial journalist.