He moved to South Africa in 1894, and was employed at Transvaal Museum from 1896.
Her work is present at museums all over the world, like Musée des Merveilles in Tende, Field Museum of Natural History in Chicago, Transvaal Museum in Pretoria and Naturhistoriska riksmuseet in Stockholm.
British Museum | Museum of Modern Art | Metropolitan Museum of Art | American Museum of Natural History | Victoria and Albert Museum | Transvaal | 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 | National Air and Space Museum | Brooklyn Museum | Transvaal Province | 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 |