The Northern Virginia doctor knows at least that much about his situation. He knows he is no longer considered a citizen of the United States — the place where he was born, went to school and has practiced medicine for more than 30 years — and that he also belongs to no other place.
A letter from a State Department official informed him that he should not have been granted citizenship at the time of his birth because his father was a diplomat with the Embassy of Iran. The letter directed Sobhani to a website where he could apply for lawful permanent residence.
You get citizenship based on being born in the US - jus solis - which this man was, until the State Department decided differently. The other way to become US citizen is by requesting it . That is possibe after five (in case of marriage three) years of living in the USA as a Legal Permanent Resident.