Doctor Atl, pseudonym of Gerardo Murillo (born October 3, 1875, Guadalajara, Mexico—died August 15, 1964, Mexico City) painter and writer who was one of the pioneers of the Mexican movement for artistic nationalism.

Educated in Mexico City, Rome, and Peru, he founded the journal Action d’Art in Paris in 1913 and edited it for three years. The paintings he created during that period generally imitated popular European trends such as Post-Impressionism.

Returning to Mexico when the revolution broke, he founded the radical journal Acción Mundiale in 1916 and became its editor. During that period he became active in the muralist movement along with politically active figures such as José Clemente Orozco, Diego River...