Roberts, John Glover, Jr.
In 2005 he was nominated by President G. W. Bush to the Supreme Court and, after Rehnquist's death several months later, was then named and confirmed as chief justice. Intelligent with a sharp legal mind, Roberts was an advocate of conservative positions in the Reagan and Bush administrations but was nonetheless a relative unknown judicially at the time of his confirmation to the Supreme Court because of the short time he had served on the appeals court. Although the Roberts court has been markedly conservative and pro-business, in some cases reversing earlier precedence, and Roberts has generally been in the conservative majority or minority, he diverged from expectation when he upheld (2012) the Affordable Care Act's requirement that most Americans obtain health insurance.
See L. Tribe and J. Matz, Uncertain Justice: The Roberts Court and the Constitution (2014).
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