Prior to this , the United States had maintained a AAA credit rating since 1941 .
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+ .
Prior to this , the United States Treasury   had maintained a AAA credit rating since 1941 .
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+ .