On September 17, Constitution Day, Patrick Spero—the incoming chief executive officer of the American Philosophical Society’s Library & Museum in Philadelphia—will release his new book, The Scientist Turned Spy: André Michaux, Thomas Jefferson, and the Conspiracy of 1793. It explores the incredible story of an explorer, André Michaux, drawn into a plot orchestrated by the French government to exploit tensions between American settlers and Spanish authorities in the Louisiana region, with the aim of setting up an independent republic. In this episode, Spero joins Jeffrey Rosen to discuss the history of this conspiracy and explore new evidence implicating Thomas Jefferson in the plot, as well as the American Philosophical Society and Jefferson’s role in it.  

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