James Agee, author of the seminal documentary work, Let Us Now Praise Famous Men: Three Tenant Families had this to say about Helen Levitt's work.
“At least a dozen of Helen Levitt’s photographs seem to me as beautiful, perceptive, satisfying, and enduring as any lyrical work that I know. In their general quality and coherence, moreover, the photographs as a whole body, as a book, seem to me to combine into a unified view of the world, an uninsistent but irrefutable manifesto of a way of seeing, and in a gently and wholly unpretentious way, a major poetic work.”
NYT article from March 30, 2009, Art and Design.
NPR's All Things Considered story from 2002.