Neiman’s artwork has been the subject of more than 200 solo exhibitions and 100 group exhibitions organized by esteemed museums. These include the Indianapolis Museum of Art, the Art Institute of Chicago, the Whitney Museum of American Art, the Carnegie Institute of Art, and a dual exhibition alongside Andy Warhol at the Los Angeles Institute of Contemporary Art in 1981.
Neiman served as a member of the New York City Advisory Commission for Cultural Affairs from 1995 until his death in 2012. He received the Award of Merit from the American Athletic Union in 1976, and a Gold Plate Award from the American Academy of Achievement in 1977. The artist is also renowned for his charitable efforts, providing donations to Columbia University and the School of the Art Institute in Chicago.