The College Board's Advanced Placement (AP) program now serves as a strong vehicle for promoting high academic standards, with college-level work for high school students. The product of a unique collaboration between high school teachers and college faculty dating back to the 1950s, AP is the de facto standard for academic programs that help students make the transition from high school to college. The recognition of AP as a program of academic excellence has, in turn, fueled a rapid expansion in the number of students taking the examinations. Last year, approximately 250,000 students took the Advanced Placement United States History examination. With this growth comes the continued twin challenges of maintaining high standards that correspond with advances in each discipline, and expanding access to these rigorous courses in much more equitable ways. In this article we provide a brief overview of college faculty's involvement in the school-college collaboration that is AP, including the College Board's expanded efforts to strengthen its support to AP teachers.