The first step is to recognize who is an asshole. Face your past. The past is a very good predictor of future behavior. For example, were you a bully in school? If your parents and siblings were assholes, you may have caught the disease. Do not make people feel oppressed, humiliated, de-energized, or belittled.
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He initially wrote an essay  for the Harvard Business Review , published in the breakthrough ideas for Following the essay, he received more than a thousand of emails and testimonies. Among other reasons disclosed in another article  published at the Harvard Business Review , it led him to write the book. The book sold over , copies and won the Quill Award for best business book in The theme of this book is that bullying behaviour in the workplace worsens morale and productivity.