Here is his profile as listed on the Department of Justice Website. He was deputy solictor General under Ken Starr and an advisor to Bush during Gore v. Bush.

Mr. Roberts is the head of Hogan & Hartson’s Appellate Practice Group. He graduated from Harvard College, summa cum laude, in 1976, and received his law degree, magna cum laude, in 1979 from the Harvard Law School, where he was managing editor of the Harvard Law Review. Following graduation he clerked for Judge Henry J. Friendly of the United States Court of Appeals for the Second Circuit, and the following year for then-Associate Justice William H. Rehnquist.

Following his clerkship experience, Mr. Roberts served as Special Assistant to United States Attorney General William French Smith. In 1982 President Reagan appointed Mr. Roberts to the White House Staff as Associate Counsel to the President, a position in which he served until joining Hogan & Hartson in 1986. Mr. Roberts’ responsibilities as Associate Counsel to the President included counseling on the President’s constitutional powers and responsibilities, as well as other legal issues affecting the executive branch.

At Hogan & Hartson, Mr. Roberts developed a civil litigation practice, with an emphasis on appellate matters. He personally argued before the United States Supreme Court and the lower federal courts, participating in a wide variety of matters on behalf of corporate clients, trade associations, governments, and individuals.

Mr. Roberts left the firm in 1989 to accept appointment as Principal Deputy Solicitor General of the United States, a position in which he served until returning to the firm in 1993. In that capacity he personally argued before the Supreme Court and the federal courts of appeals on behalf of the United States, and participated in formulating the litigation position of the government and determining when the government would appeal adverse decisions. Mr. Roberts had general substantive responsibility within the Office of the Solicitor General for cases arising from the Civil and Civil Rights Divisions of the Justice Department, as well as from a variety of independent agencies.

Mr. Roberts has presented oral arguments before the Supreme Court in more than thirty cases, covering the full range of the Court’s jurisdiction, including admiralty, antitrust, arbitration, environmental law, First Amendment, health care law, Indian law, bankruptcy, tax, regulation of financial institutions, administrative law, labor law, federal jurisdiction and procedure, interstate commerce, civil rights, and criminal law.