About This Stamp
In 2011, the Postal Service celebrates the achievements of chemist Melvin Calvin, botanist Asa Gray, physicist Maria Goeppert Mayer, and biochemist Severo Ochoa. This American Scientists issuance is the third in a series honoring individuals who have made extraordinary contributions to the advancement of science.
Melvin Calvin (1911-1997) advanced our understanding of photosynthesis and conducted pioneering research on using plants as an alternative energy source. He won the Nobel Prize in chemistry in 1961. The stamp art includes a photograph of him taken by Yousuf Karsh. The background shows excerpts from the carbon cycle, and chemical symbols and structures he used to represent the process of photosynthesis.
Asa Gray (1810-1888), one of the nation’s first professional botanists, advanced the specialized field of plant geography and became the principal American advocate of evolutionary theory in the mid-nineteenth century. The stamp art features illustrations of plants studied by Gray and the words “Shortia galacifolia” in Gray’s handwriting.
Maria Goeppert Mayer (1906-1972) developed a theoretical model that helped explain the structure of the atomic nucleus; for this work she became the only woman other than Marie Curie to win a Nobel Prize in physics. The stamp art combines photographs of Mayer with a chart and a diagram she used to illustrate aspects of the atomic nucleus.
Severo Ochoa (1905-1993), a biochemist, was the first scientist to synthesize ribonucleic acid (RNA) and competed in the race to decipher the genetic code. He won the Nobel Prize in physiology or medicine in 1959. The stamp shows Ochoa in his laboratory in 1959, along with figures representing some of his work on protein synthesis.
Art director Ethel Kessler worked with designer Greg Berger to make each stamp a carefully structured collage of photographs, signatures, and representations of equations and diagrams associated with the scientist’s research.
The American Scientists stamps are being issued in panes of 20 self-adhesive Forever® stamps. Forever® stamps are always equal in value to the current First-Class Mail one-ounce rate.
Stamp Art Director
Ethel Kessler
Ethel Kessler is an award-winning designer and art director who has worked with corporations, museums, public and private institutions, professional service organizations, and now, the United States Postal Service.
After earning a B.F.A. in visual communications from the Maryland Institute College of Art, Kessler worked as a graphic designer and project manager for the exhibits division of the United States Information Agency. Her work was distributed internationally on subjects such as Immigration, Entrepreneurship, Renovation of American Cities, and the Bicentennial of 1976. She was also responsible for exhibits in Morocco, Botswana, and El Salvador.
In 1981, she established Kessler Design, Inc., for which she is creative director and designer. Clients have included the Clinton Government reorganization, the Smithsonian Institution, National Geographic Television, the National Park Service, and the American Institute of Architects.
She has been an art director for the U.S. Postal Service’s stamp development program for more than 25 years. As an art director for USPS, Kessler has been responsible for creating more than 500 stamp designs, including the Breast Cancer Research stamp illustrated by Whitney Sherman. Issued in 1998, the stamp is still on sale and has raised more $98 million for breast cancer research. Other Kessler projects include the popular and highly regarded Nature of America 120 stamp series, a collaboration with nationally acclaimed nature illustrator John Dawson, the 12-year Lunar New Year series with Kam Mak, the American Filmmaking: Behind the Scenes 10 stamps issued in 2003, a 2016 pane of stamps celebrating the 100th anniversary of the National Park Service, and the 2023 stamp honoring Supreme Court Associate Justice Ruth Bader Ginsburg. And many, many others.