Despite Dumas' refusal to let him take credit for his work, Nerval continued to collaborate with Dumas on plays. In the summer of 1838, he traveled with Dumas to Germany to work on "Léo Burckart," which eventually premiered at the Théâtre de la Porte-Saint-Martin on 16 April 1839, six days after the premiere of another play the pair worked on together called "L'Alchimiste." In November 1839, Nerval traveled to Vienna, where he met the pianist Marie Pleyel at the French embassy.