Born in Belgium in 1947, Poncelet came to England with her parents in 1951. Studying ceramics at both Wolverhampton School of Art and the Royal College of Art, she subsequently established herself as a major figure on the international ceramics scene in the 1970s and 80s. In the 1990s she diversified her practice to include painting, sculpture and public art commissions. Today she is widely recognised as one of the most important potters of her generation, part of a group of women who emerged, primarily from the Royal College of Art, in the 1970s. This also included Alison Britton, Carol McNicoll and Elizabeth Fritsch.