How to handle a coworker who keeps giving you false information: ‘You can’t ignore it,’ says expert

In a column for CNBC Make It, former Columbia Business School executive education faculty member Dorie Clark explains how to handle a coworker who seems to believe their own false claims. She opens with Theranos founder Elizabeth Holmes, who is back in the news with a new documentary. Clark has consulted for companies including Google and Microsoft, and she warns that ignoring a pattern of broken promises can leave you "holding the bag when things unravel."