This Introduction provides a rationale for a collection of new paper on Thomas Kuhn. Scholarship on Kuhn has changed dramatically in the last 20 years for numerous reasons. First, scholars studying Kuhn no longer focus narrowly on Structure of Scientific Revolutions. Scholars have been giving careful consideration to Kuhn’s later work. Second, many scholars have been drawing on the vast unpublished resources at the Thomas S. Kuhn Archive at MIT. Third, with the 50th anniversary of the publication of Structure in 2012, there were quite a number of conferences held which led to the publication of a number of volumes reflecting on Kuhn’s impact in philosophy and history of science. These three developments have contributed significantly to our collective understanding of Kuhn and his theories of scientific change and scientific knowledge. Though Kuhn’s position in the philosophy of science can be difficult to gauge, by objective measures Kuhn’s impact is undeniable. Kuhn’s influence outside philosophy of science is also astounding, especially in the social sciences. So it is beyond dispute that Kuhn has had a profound and wide-ranging impact on scholarship.