Public defenders must be licensed to practice law by their state bar. To work as a public defender, complete your bachelor’s degree, take the LSAT exam, and attend law school to earn a J.D. degree. Focus your studies on criminal defense law, and hone your research skills. During your law school summers take internships in public defender offices. You can also intern in a prosecutor’s office or a public interest firm to gain experience for a career as a public defender. After you complete law school you must pass your state’s bar exam. Most states also require legal professionals to pass the Multistate Professional Responsibility Exam (MPRE). Once you are licensed to practice law in your state, you can apply to public defender offices.