National Football League | National Register of Historic Places | National Hockey League | British Museum | Museum of Modern Art | England national football team | Metropolitan Museum of Art | National Basketball Association | National Science Foundation | National Geographic | National Trust | National Endowment for the Arts | National Geographic Society | Argentina national football team | National Trust for Places of Historic Interest or Natural Beauty | National Park Service | National League | Australian National University | National Guard | National Geographic Channel | National Institutes of Health | American Museum of Natural History | National Guard of the United States | National Collegiate Athletic Association | United States National Research Council | National Portrait Gallery | National Academy of Sciences | Indian National Congress | United States men's national soccer team | Victoria and Albert Museum |
A part of his valuable United States collection was bequeathed to the Smithsonian Institution’s National Postal Museum in Washington, D.C. Ackerman was named to the American Philatelic Society Hall of Fame in 2000.