C. Terry Warner is an American academic, author and business consultant. He co-wrote the business leadership book "Leadership and Self-Deception" and founded the Arbinger Institute, which does consulting and training based on his academic work on the foundations of human behavior and self-deception. In writings and seminars, Warner argues that people are responsible for their own actions and even negative emotions which are often used to accuse others rather than responding to their needs, and that people therefore have the power to free their relationships with others from negativity.