When did the author of Bell Atlantic Corp. v. Twombly start serving on the Supreme Court?
Bell Atlantic Corp. v. Twombly:  Authored by Justice David Souter, it established that parallel conduct, absent evidence of agreement, is insufficient to sustain an antitrust action under § 1 of the Sherman Act. David Souter:  He served from October 1990 until his retirement in June 2009.
October 1990