John Burton Chambers (born c. 1955)[1] is deputy head of the Sovereign Debt Ratings Group and chairman of the Sovereign Debt Committee at Standard and Poor's (S&P).
[2][3] Along with David T. Beers, Chambers earned significant attention in August 2011 for his role in downgrading the credit rating of United States Treasury bonds to AA+.
[4] Prior to this, the United States had maintained a AAA credit rating since 1941.
[1][6][7] After working five years in various roles as sous directeur (deputy director), assistant comptroller, and vice president for Banque Indosuez,[7] Chambers joined S&P in 1993.
He became deputy head of S&P's Sovereign Debt Ratings Group in 1997.