The breathless pace of development means data protection regulators need to be prepared for another scandal like Cambridge Analytica, says Wojciech Wiewiórowski, the EU's data watchdog. Wiewiórowski is the European data protection supervisor, and he is a powerful figure. His role is to hold the EU accountable for its own data protection practices, monitor the cutting edge of technology, and help coordinate enforcement around the union. I spoke with him about the lessons we should learn from the past decade in tech, and what Americans need to understand about the EU's data protection philosophy. Here's what he had to say.