The precursor to Reciprocity was a project intended to produce accessible content on the Langlands Program (a sprawling research program in number theory), which I initiated and lead whilst CEO of the Wolfram Institute, a research nonprofit that I cofounded with Stephen Wolfram.  This project, which came to demand the majority of my focus as CEO, was of comparatively less importance to Stephen. The two of us decided to part ways, and Reciprocity is a new project  intended to advance and broaden the efforts that began at the Institute, beginning with the Langlands Program (as well as number theory and arithmetic geometry more broadly) and expanding to new areas of mathematics as we attract more personnel.