He entered the book trade with Scribner’s in 1927, and subsequently worked at Sotheby’s. His collaboration with G. Pollard on An Enquiry into the Nature of Certain Nineteenth Century Pamphlets (1934) exposed the forgeries of T. J. Wise. Other major publications included Taste and Technique in Book-Collecting (1948), Printing and the Mind of Man (1963), and the ABC for Book Collectors (1952; 8e, 2004).
From The Oxford Companion to the Book in Oxford Reference.