Martín RamírezMartn Ramrez, a Mexican migrant worker and psychiatric patient without formal artistic training, has been hailed by leading New York art critics as one of the twentieth centurys greatest artists. His work has been exhibited alongside masters such as Jos Clemente Orozco, Diego Rivera, Rufino Tamayo, Salvador Dal, Marc Chagall, Paul Klee, and Joan Mir. A landmark exhibition of Ramrezs work at the American Folk Art Museum in 2007 broke attendance records