Composer and violinist. Son of Alessandro Toeschi, a composer and violinist in the Mannheim orchestra. He studied with Johann Stamitz and Anton Fils, joined the Mannheim orchestra as a violinist in 1752 and was made Konzertmeisterin 1759. He moved to Munich in 1778 with Carl Theodor's entourage. A representative of the second generation of the "Mannheim school," he wrote more than sixty symphonies, many ballets, about twenty flute concertos, over thirty flute quartets, and other chamber works.