In 1957, Geismar founded the firm Brownjohn, Chermayeff & Geismar (now Chermayeff & Geismar & Haviv) with Robert Brownjohn and Ivan Chermayeff. Geismar has designed more than a hundred corporate identity programs. His designs for Xerox, Chase Manhattan Bank, Best Products, Gemini Consulting, PBS, Univision, Rockefeller Center and, most notably, Mobil (1964) have received worldwide acclaim. Geismar has also had major responsibility for many of the firm's exhibition designs and world's fair pavilions. His projects include such major tourist attractions as the Ellis Island Immigration Museum, the Statue of Liberty Museum, the Truman Presidential Library, and the redesigned Star-Spangled Banner exhibition at the Smithsonian National Museum of American History. He has received major awards in the field, including one of the first Presidential Design Awards for helping to establish a national system of standardized transportation symbols.
- Chermayeff, Ivan and Tom Geismar. (2006) Watching Words Move. New York: Chronicle Books ISBN 978-0-8118-5214-2
- Chermayeff, Ivan, Tom Geismar, and Steff Geissbuhler. (2003) designing: New York: Graphis ISBN 978-1-932026-14-6
- Chermayeff & Geismar Inc. (2000) TM: Trademarks Designed by Chermayeff & Geismar. New York: Princeton Architectural Press ISBN 978-1-56898-256-4
- Geismar, Thomas H., Harvey Kahn, Ralph Sessions, Dave Hoffman (photographer). (1998) Spiritually Moving: A Collection of American Folk Art Sculpture. New York: Harry Abrams ISBN 978-0-8109-6365-8
- Marquis Who's Who on the Web
- "1998 Hall of Fame: Tom Geismar." Art Director's Hall of Fame.