A PM is the person on a product team who is responsible for choosing the right problems to go after, defining what success looks like, and guiding their team to achieve successful outcomes.

principal product manager—a person who's an individual contributor but a rock‐star performer and willing and able to tackle the toughest product work. This is a very highly regarded role and generally compensated like a director or even VP.

The entrepreneur is the dreamer, the visionary, and the creative mind. • The manager is the person who thinks about return on investment (ROI), near-term success, and productivity. • The technician gets the work done. She follows the manager’s guidance and is concerned about today’s success.