Almanac of the Federal Judiciary - often includes practitioner commentary about abilities, temperament and demeanor, and lists noteworthy cases.
Judicial Profiles - 1-2 page articles (sometimes 5+ years old), for state and federal judges in California
The American Bench - for many includes "extracurriculars" such as fraternal or academic societies, civic organizations
TheRobingRoom.com - like Yelp! for judges; not all judges are covered/rated. There certainly are ranters and trolls, but among the dross you can sometimes find real insight, honest and unbiased evaluations, or interesting bits of trivia about a judge's pet peeves and personality quirks. Worth a look if you have internet access while waiting at the airport.
Confirmation hearings - for federal judges, or anyone who has been nominated for a federal judgeship, search Proquest Congressional:
Perform a basic literature search for your judge as author:
You may not want to read all of these materials, but just scan titles and subject headings to see what topics your judge has written about.
Judge Analytics (on Ravel Law, a research platform focusing on visualizations of data about legal materials) is a tool for analyzing a judge's decisional patterns; it provides data on precedent-citation analysis and issue- and trend-tracking based on her opinions and ruling/voting behavior
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