(1943) While enrolled in graduate studies at the University of Pennsylvania, Proskouriakoff prepared archeological illustrations as a volunteer at the University Museum. Through her work with the museum's Assistant Curator of the American Section, Linton Satterthwaite, Proskouriakoff received an invitation in 1936 to join the museum's excavation work at the Maya site of Piedras Negras. Although Proskouriakoff never received a degree in the field of Maya studies, her dedication and ability for it led to her receiving positions at the Carnegie Institution in Washington D.C., then later at Harvard University. Her position at Carnegie was procured when
Sylvanus Morley saw the panoramic reconstruction on a visit to the museum; he was impressed and prevailed upon her to make more for the
Carnegie Institution of Washington. Unable to get the institution to hire her, he raised funds to enable Proskouriakoff to travel to
Copán and
Yucatán, which she did in 1939. Returning after she completed the drawings, she was given the post of a research associate at the Institution in the early 1940s. She soon became involved in
Maya hieroglyphs and made significant contributions to the understanding of Mayan written language. For example, her 1942 scholarly analysis of the hieroglyphics at the
Takalik Abaj ruins in
Guatemala establish that the site was in part
Maya, settling a debate at that time. Her greatest contribution was considered the breakthrough for Maya hieroglyphic decipherment in the late 1950s and early 1960s. While researching the chronology of changing styles of Maya sculpture, she discovered that the dates shown on the monumental stelae were actually historical, the birth, accession, and death dates for Maya rulers. Analyzing the pattern of dates and hieroglyphs, she was able to demonstrate a sequence of seven rulers who ruled over a span of two hundred years. Knowing the context of the inscriptions, Maya epigraphers were then able to decipher the hieroglyphs. She became honorary curator,
Maya art, of the
Peabody Museum in 1958. ==Death==