or one of his favorites. I found this from an article about a speech he made at Wake Forest.
Nevertheless, after describing the general back-and-forth procedure he takes before deciding a case, Roberts fielded questions from the audience. Dinan recalled one particular question from a student concerning Roberts’ favorite justice.
Expecting to hear him say either Antonin Scalia or Clarence Thomas, who are known for taking more conservative stances, he was surprised when Roberts reached back in history to name Robert Jackson and Felix Frankfurter, both nominees of President Franklin D. Roosevelt.
http://ogb.wfu.edu/?id=2531_0_9_0_M