Looking for all of the opinions in the DC Circuit written by President Obama’s nominee to the Supreme Court, try this search on
Westlaw: advanced: JU(garland)
You can also find a few law review articles written by him using HeinOnline. Select Advanced Search and then enter his name in the Author field. He has written Deregulation and Judicial Review, 98 Harv. L. Rev. 505 (1984-1985) and Antitrust and State Action: Economic Efficiency and the Political Process, 96 Yale L.J. 486 (Jan. 1987)
For more information on past nominees to the Supreme Court, check out the Supreme Court Nomination Guide.