U. S Immigration Lawyer for Help for a South African

My father has been trying to figure out how to immigration united states from south Africa for a few years now.  It seems the government officials in south Africa are not very willing to help him.  Could he use a immigration lawyer from the United States to help him fulfill his dream?  My Uncle has been in the States for many years now and could contact a representative there if it would be of any help to my father. He knows the process can take a very long time, and would like to get it started as soon as possible.