Arnold Leibowitz has written extensively about the territories, Commonwealth, and Freely Associated States of the United States, and has represented almost all of them before the Federal government since 1964 when he was General Counsel of the U.S.-P.R. Commission on the Status of Puerto Rico. He was counsel to the Guam and Virgin Islands Constitutional Commission and Commission on Self-Determination and to the Virgin Islands Commission on Status, and has represented the governments of Guam, American Samoa and the Republic of Palau.