Harvard expert reveals top 'red flag' trait CEOs dislike in employees.

Taking credit for other people's ideas is the most undesirable trait an employee can have, according to Harvard career expert Heidi K. Gardner. It signals either a lack of trustworthiness or competence, and is unethical and disrespectful to colleagues. Gardner advises being transparent about who contributed to a project to avoid being seen as untrustworthy. Trustworthiness is the most valuable trait in any employee, according to billionaire Warren Buffett. Gardner advocates "smart collaboration" to increase trust, productivity and quality of work.