Mark W Schaefer
Mark W. Schaefer is the author of the world's best-selling book on Twitter (The Tao of Twitter), the first book on influencer marketing (Return On Influence), an essential book on blogging (Born to Blog), a beloved introduction to social media marketing (Social Media Explained), a path-finding book on content marketing (The Content Code), a book of essays (LESSONS), the world's most popular book on personal branding (KNOWN), and "Marketing Rebellion" an Amazon best-seller that is a spell-binding look at the unexpected future of marketing.