Over the course of his life, Robert Lowell impressed those who knew him by his "refusal to be boring on paper" (Christopher Benfey). One of the most influential poets of the twentieth century, Lowell was also a prolific letter writer who corresponded with many of the remarkable writers and thinkers of his day, including Elizabeth Bishop, Edmund Wilson, Robert Kennedy, Ezra Pound, William Carlos Williams, T. S. Eliot, and Robert Frost.