Authors of non-fiction books have considerable expertise in the subject area of their books – it's what made them qualified to write. When it comes time to launch a promotional campaign, book marketing companies increasingly recommend authors write bylined articles in relevant media. The purpose is to gain exposure and gently plug a book in the brief bio that runs at the end of the article. It's easy to see how it helps with publicity because once someone has read and enjoyed an article, they are likely to want to find out more, and buying a book is a natural way to do it. Media make room for good articles. If you've never written a bylined article before, 700-900 words is generally an ideal length. The point is to promote your expertise and credibility (with media exposure provided by the articles) in the same topic area as your book – or a complimentary one. Always try to make the article about actionable suggestions, case studies, how-to- and other noteworthy ideas. ...
Founded in 1997 by Dan Smith, Smith Publicity Inc. began as a one-person operation and has evolved into the most prolific and successful book marketing, book publicity and book promotion agency in the publishing industry. The firm has promoted over 3,500 books and authors – the most ever by a book publicity agency in publishing history. https://www.smithpublicity.com/