On pages 6 and 7 of the Sussmann indictment, “Tech Executive-1” is most likely Rodney Joffe of Neustar and is now a target of the investigation. “Campaign Lawyer-1” is Marc Elias who until recently was a partner with Perkins Coie. The “U.S. Investigative Firm” is probably Fusion GPS.
Sussman Indictment, paragraph 20, page 6
Sussmann indictment, page 7