January 2014 marked the 25th anniversary of the formal adoption of the National School Psychology Certification System (NSPCS) by NASP leadership. This article briefly traces the history of the NSPCS from the efforts that occurred in the late 1980s to develop this national credential, recent changes to renewal requirements, the development of the Approved Provider System, and the offering of the Special Renewal Opportunity to those who had let their NCSP credentials expire after three years. The article notes that the NSPCS has had an enormous impact on the profession--a trend that will likely continue given the relationship among the NCSP credential and NASP's professional standards, state credentialing standards, and district-level hiring practices and incentives.