The people of the NIH work in research settings, in clinics, out in the field, and on nearly every continent. Many are world-renowned experts in their respective disciplines. The workforce of the NIH is similar in nature to that of universities and academic medical centers. Anchored by 1,200 Principle Investigators, tenured or tenure-track scientists directing research programs with distinct scientific agendas, the next generation of scientists is also mentored through various training and fellowships.