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William Penton Sears (born 9 December 1939) is an American pediatrician and the author or co-author of more than 30 parenting books, most notably several in the "Sears Parenting Library." He is a frequent guest on television talkshows, where he goes by the name Dr. Bill. He and his wife Martha Sears, R.N., are among the leading proponents of the attachment parenting philosophy.