Sonia Sekula, also known as Sonja Sekula was a Swiss-born artist linked with the abstract expressionist movement, notable for her activity as an "out" lesbian in the New York art world during the 1940s and early 1950s. Sekula was also one of very few women members of the Club. Sekula was born in Lucerne Switzerland to a Swiss mother and a Hungarian father.

She lived in America from 1936 to 1955. Sekula attended Sarah Lawrence College. She met the surrealists in exile in New York during 1942. She studied art in New York at Sarah Lawrence College and the Art Students League where she befriended such luminaries as choreographer Merce Cunningham, composer John Cage, and artists such as Robert Motherwell, and Jackson Pollcock, the latter with whom she exhibited at Peggy Guggenheim’s Art of this Century Gallery in New York and showed at the Betty Parsons Gallery.

Sekula’s delicacy of her line and her tendency to section the surface into separate areas and compartments seems to connect her to another Swiss artist, Paul Klee. Sekula divides the horizontal canvas into a field of different-sized diamonds, rectangles, semi-circles, triangles, and irregular geometric forms utilizing both bright and dark colors with a unique style of her own, quite an abstract calligraphic style, with finely outlined forms, bold colors and shapes. Sekula hanged herself in her studio in Zurich, Switzerland after having many years of mental health issues. Sekula is buried in St. Moritz, Switzerland as she had requested in a letter to her mother. Sekula’s works are now in the collections of many important and private collections, including the Guggenheim, MoMA, Brooklyn Museum of Art, Whitney, Kunstmuseum, San Francisco Museum of Modern Art and the Metropolitan.