statesman and diplomat who prepared the declaration of Switzerland's permanent neutrality ratified by the great powers in 1815.

After serving in the French army, Pictet settled in Geneva in 1789 and reorganized the militia. He was arrested during the Reign of Terror (1794) in Geneva following the French Revolution and subsequently was imprisoned. With the reestablishment of the Republic of Geneva after the retreat of Napoleon's armies (1813), he resumed political activity, taking part in the provisional government created in December 1813.

In January 1814 Pictet argued on behalf of Geneva's independence and union with the Swiss Confederation before the allied sovereigns at Basel and later obtained recognition of his canton's independence in the Treaty of Paris (May 1814). In October 1814 he was delegated to the Congress of Vienna, where he helped secure Geneva's attachment to the reconstructed Swiss Confederation; and at the Paris peace conference (August–November 1815) that followed Napoleon's defeat at Waterloo, he served as representative of the whole confederation. He personally redrafted the act that was accepted as the basis of permanent Swiss neutrality by the powers on March 20, 1815. His last diplomatic mission—to Turin (January–March 1816)—secured a rectification of the Swiss-Sardinian frontier (Treaty of Turin, March 1816).