New York State requires teachers to obtain certification in order to teach. There are two types of certifications - initial certification, which is entry-level, and professional certification, which is advanced-level. To obtain professional certification, teachers must complete a master's degree program, teach full-time for three years, complete a mentoring experience, and pass additional certification exams within five years of obtaining their initial certification. Teachers with professional certification must complete 175 hours of professional development every five years to maintain their certification.