[1] She studied book illustrating at Boston University and spent a year training and drafting for the Army Map Service.
[2] Gast worked at the Departments of Vertebrate and Invertebrate Zoology at the Smithsonian National Museum of Natural History, Washington D.C.,[3] from 1954 to 1985.
[5] Her most well known and reproduced illustration is of the loriciferan phylum pliciloricus enigmatus,[6] which was discovered in 1983 by the Danish biologist Reinhardt Møbjerg Kristensen in the microscopic ecosystem between grains of sand.
[9] She invented an ultra mini-vacuum cleaner that could be held in one hand for taking excess carbon dust from the illustration board.
[2] In 1984, the National Museum of Natural History held an exhibition of 80 of Gast's works, including illustrations of fossils, fish, insects and invertebrates.