(December 1, 2015, 8:45 AM EST) -- BOSTON — A reinsured insurer told a federal court in Massachusetts on Nov. 20 that its reinsurer’s party-appointed arbitrator should be disqualified because of his employment history (John Hancock Life Insurance Company [U.S.A.] v. Employers Reassurance Corporation, No. 15-cv-13626, D. Mass.)....