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.
Gretta exhibited her work at institutions such as Museu de Arte Contemporânea da Universidade de São Paulo , Museu de Arte Moderna de São Paulo, Museu de Arte de São Paulo, Museu Nacional de Belas Artes, Pinacoteca do Estado de São Paulo, Instituto Moreira Salles, Museu de Arte da Pampulha, Musée d'Art Moderne de la Ville de Paris, Palazzo dei Diamanti de Ferrara, Fundação Calouste Gulbenkian, Musée cantonal des beaux-arts de Lausanne, Centro Georges Pompidou, Le Bal Musée d’Art Paris Museum of Modern Art of New York, The Art Institute of Chicago, University of California San Diego, New York University, among others.