Question: John W. Sidgmore, became the Chief Executive Officer of UUNET Technologies in June 1994, Sidgmore worked to revive WorldCom after disgraced CEO Bernard Ebbers, a Canadian businessman, that co-founded which telecommunications company?
Sentence (from "Jonathan G. Ornstein"): Jonathan Ornstein is Chairman and Chief Executive Officer of Mesa Air Group, Inc., and was appointed effective May 1, 1998.
Relevant evidence: No