Dr. Fischbein is the curator of the New York City museum where the Tortellini Emerald is showcased. However, he knows little about the gemstone, as his expertise is in paleontology. He admits as much in his interview with April O'Neil.
After The Great Boldini steals the emerald, Fischbein sequesters all of the museum's patrons inside so they can be searched for the jewel.