Frank O'Hara was a dynamic leader of the "New York School" of poets. From the beginning O'Hara's poetry was engaged with the worlds of music, dance, and painting. In that complex of associations, he devised an idea of poetic form that allowed the inclusion of many kinds of events, including everyday conversations and notes about New York advertising signs.
Since his death in 1966 at age forty, the depth and richness of his achievements as a poet and art critic have been recognized by an international audience. As the painter Alex Katz remarked, "Frank's business was being an active intellectual." He was that. His articulate intelligence made new proposals for poetic form possible in American poetry.
Source: https://www.poetryfoundation.org/