Haring had a maintenance job at the Pittsburgh Center for the Arts and was able to explore the art of Jean Dubuffet, Jackson Pollock, and Mark Tobey. He was highly influenced around this time by a 1977 retrospective of Pierre Alechinsky's work and by a lecture that the sculptor Christo gave in 1978. From Alechinsky's work, he felt encouraged to create large images that featured writing and characters. From Christo, Haring was introduced to ways of incorporating the public into his art. His first important one-man exhibition was in Pittsburgh at the Center for the Arts in 1978.