Gretta Alegre Sarfaty also known as Gretta Grzywacz and Greta Sarfaty Marchant, is a painter, photographer and multimedia artist who earned international acclaim in the 1970s, from her artistic works related to Body art and Feminism. Born in Greece, she moved with her family to São Paulo in 1954. From 1976 she lives and works in London, São Paulo and New York. Alongside her art she was the founder of the project-led space, Sartorial Contemporary Art (2005–2010) and since 2010 has been running a family trust the Alegre Sarfaty Collection.