He was a collector and seller of antiques and art, especially colonial art and Mexican handcrafts and folk art.
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Here he continued collecting and selling objects such as colonial art and Mexican handcrafts and folk art, being one of the early exponents for the appreciation of these objects.
The Los Angeles Times has described Cowen as "a man who can talk about Haitian voodoo flags, Iranian cinema, Hong Kong cuisine, Abstract Expressionism, Zairian music and Mexican folk art with seemingly equal facility".
Museum of Modern Art | Art Deco | Metropolitan Museum of Art | folk music | folk | Mexican people | Art Institute of Chicago | Folk music | San Francisco Museum of Modern Art | National Gallery of Art | Honolulu Museum of Art | Whitney Museum of American Art | Los Angeles County Museum of Art | Art Nouveau | Royal College of Art | Walker Art Center | Mexican-American War | art | Glasgow School of Art | Museum of Contemporary Art | folk rock | Philadelphia Museum of Art | Smithsonian American Art Museum | Mexican League | Art Students League of New York | Mexican Revolution | Denver Art Museum | Cleveland Museum of Art | Museum of Contemporary Art, Los Angeles | Art Gallery of New South Wales |