There are over 10 reasons to become a licensed professional engineer (PE), but they fall into four main categories: legal necessity, improved employment security, better opportunities for advancement, and personal satisfaction. Some key reasons include: being legally required to sign engineering documents; making an engineer more competitive for jobs and promotions; meeting standards that indicate professional competence and ethical practice; and preparing an engineer for changing requirements in different states, countries, or industries over their career. The best time to start the licensing process is now by contacting one's state licensing board.