Helen Siegl studied art in her native Austria under Professor Oswald Haetel at the Academie Fur Angewandte Kunst, Vienna. She applied and then recieved an apprenticship with Haetel and worked in his studio from 1946 to 1951. In 1952, Siegl moved to Montreal, Canada, and shortly thereafter married Theodor Siegl, Conservator of Paintings for the Philadelphia Museum of Art. Living in Philadelphia, she became an American citizen in 1959.
During her career, Helen Siegl gained a large reputation for both her individual signed and numbered prints and for her book illustrations. In this latter category, she illustrated such well known works as Aesop's Fables (Random House), Birds and Beasts (World Publishing), Earrings for Celia (Pantheon), Indian Tales (Random House) and Mother Goose & Herbal (Janus Press). As well, she also designed calendars for UNICEF.
As a printmaker, Siegl was well known for her innovative techniques, often combining wood blocks, linoleum block and even plaster blocks within the same work of art. Siegl's original woodcuts are now included in the permanent collections of such major galleries as The Philadelphia Museum of Fine Art, the New York Public Library and the Library of Congress, Washington, DC