John R. Tunheim is an American lawyer who serves as a United States district judge of the United States District Court for the District of Minnesota. Judge John Tunheim served as chairman of the Assassination Records Review Board which oversaw the collection of government records relating to the assassination of President Kennedy. The President John F. Kennedy Assassination Records Collection Act of 1992 created the Assassination Records Review Board as an independent agency to re-examine for release the assassination-related records that federal agencies still regarded as too sensitive to open to the public.