This volume honors important traditions and events. e first is the Administrative Conference's commitment to publishing significant reference works-labeled "sourcebooks"- that are invaluable tools for agencies, executive officials, members of Congress, and the general public. A complete list of prior Conference sourcebooks and other publications can be found on our website. This Sourcebook also honors a 32-year-old classic by Ronald Moe of the Congressional Research Service, called the Federal Executive Establishment: Evolutions and Trends, published by the Senate Governmental Affairs Committee in May 1980. The Moe report described and analyzed the growth, development and operation of federal agencies, and has proven an indispensable reference tool for government officials and academics alike, as I can personally attest. e present volume expands, deepens, and updates the research in the Moe report, while acknowledging the debt owed to CRS and the Senate Committee for publishing in-depth research on governmental organizations. The report has been prepared by the Office of the Chairman, which means that it is not the result of the formal approval process used by the Council and the Assembly of the Administrative Conference for Conference recommendations, although numerous Conference members provided their input as the work progressed. But the Office of the Chairman designation elides the work of individuals who should be recognized. At the Conference, this includes our Research Director, Gretchen Jacobs, and Deputy General Counsel, David Pritzker, who reviewed and edited various drafts along the way to publication. It also includes Jeffrey Lubbers, now Special Counsel, who brought to my attention the Moe report many years ago when Jeff was the Conference's Research