Mujica's work is wide-ranging, covering philosophy, anthropology, fiction, and poetry. At the age of thirteen, he began working at a glass factory, taking over for his father, who was blinded in a work accident. Ten years later, he arrived to the US in the early sixties and spent the decade in Greenwich Village and at the Free University studying the visual arts. He later became a Trappist monk and took a seven-year vow of silence. He has been a Catholic priest for more than two decades. In 2013, Vaso Roto, one of the Spanish-speaking world's most prestigious presses, published his "Complete Poetry, 1983-2011". That same year, Mujica won Spain's coveted Casa de América Poetry Prize with Cuando todo calla.