In 1859 he was appointed as the director of the newly founded Naturhistorisches Museum (Braunschweig) and in 1866 also of the Herzog Anton Ulrich Museum.
British Museum | Museum of Modern Art | Metropolitan Museum of Art | Anton Chekhov | American Museum of Natural History | Victoria and Albert Museum | Natural History Museum | San Francisco Museum of Modern Art | Honolulu Museum of Art | museum | Whitney Museum of American Art | Museum of Fine Arts, Boston | Los Angeles County Museum of Art | Solomon R. Guggenheim Museum | Werner Herzog | National Air and Space Museum | Brooklyn Museum | National Baseball Hall of Fame and Museum | Hermitage Museum | National Museum of Racing and Hall of Fame | Museum of Contemporary Art | Field Museum of Natural History | Philadelphia Museum of Art | Imperial War Museum | Smithsonian American Art Museum | National Museum | National Museum of Natural History | Museum of Fine Arts, Houston | Denver Art Museum | Cleveland Museum of Art |
This is followed by some unique pieces of medium-large format on canvas as the painting of Saint Peter, in the Herzog Anton Ulrich Museum in Braunschweig and the painting of the stoning of St. Stephen.