Based on the latest Sisk data, here are the twenty-five most-cited public law professors in the U.S. for the period 2013-2017 (inclusive) (remember that the data was collected in late May of 2018, and that the pre-2018 database did expand a bit since then). There isn't a fine line bettwen public law and constitutional law, obviously, but for purposes here "public law" includes administrative law, environmental law, legislation and legislative process, statutory interpretation, and regulatory law more generally (e.g., food and drug regulation, or telecommunications). (Election law will be ranked separately.) Given the large number of fields, I've listed 25 highly-cited scholars; several work in more than one of these sub-fields. Numbers are rounded to the nearest five. Faculty for whom 75% or more of their citations (based on a sample) are in this area are listed; others with less than 75% of their citations in this field (but still a plurality) are listed in the category of "other highly cited scholars who work partly in this area."