One of the most powerful forms of influence, according to psychologist Robert Cialdini’s famous analysis, is authority — often derived from perceived expertise. When a doctor advises us to exercise more, or a Nobel Laureate raises questions about a certain economic policy, we’re likely to pay much more attention than if a random person offered the same counsel. In our professional lives, this principle can be a boon: if you have a Ph.D. in a subject, or have worked in the industry for 20 years, or are seen to be an expert because you write for a certain publication, you have an increased ability to influence others.