Fifty years ago, Frank O’Hara released Lunch Poems, a collection of remarkably informal poetry that rebuked the more academic verse of his day. As a tribute, Dwight Garner writes about the importance of the book in the Times, arguing that O’Hara’s grasp of the zeitgeist is the reason he appeared on Mad Men. For more on the poet’s legacy, take a look at Christopher Richards on O’Hara’s lessons for being gay.