Federal Judges Biographical Database
The Federal Judges Biographical Database provides information about all judges who have served on the U.S. District Courts, the U.S. Courts of Appeals, the Supreme Court and other life-tenured courts since 1789. You can create customized lists of judges based on multiple categories, including nominating president, type of court, dates of service, and demographic groups.
TVC's Genie Tyburski reports that a new search feature was recently added which limits retrieval to current judges.
Source: TVC Alert
If you want to find biographical information for a judge in the Eastern District of Pennsylvania, for instance, follow the link for the database (mid-way down the page). Then select "Court" and "Limit Query to Sitting Judges." Choose your court from the drop down list and the option you want for sitting judges. Press search, and the bio for the judge should appear in the resulting list.