Seth Barrett Tillman points us to a ranking developed by HeinOnLine. I'm all about citation studies these days having just - if I may boast - chalked up my thousandth in Westlaw's law review database. The Hein study is both plausible and a little controversial, so I'm sure you'll want to take a look - at the top are Posner and Sunstein, but lower on the list are prominent, but interesting crim, enviromental, philosophical, and other scholars. Hein says that its "list is calculated based on an analysis of all articles in HeinOnline. We then ranked each author in each category: number of times cited by articles, number of times cited by articles written in the past 10 years, number of times cited by cases, and number of times accessed and averaged the rankings to produce this list of the 250 authors that scored the highest when averaging all categories."