He maintained a private law practice from 1968 to 1982 .
From 1966 to 1968 , while in law school he was a bailiff and law clerk for United States District Judge Herbert W. Christenberry of the same court on which McNamara served .
law clerk maintained a private law practice from 1968 to 1982 .
From 1966 to 1968 , while in law school he was a bailiff and law clerk for United States District Judge Herbert W. Christenberry of the same court on which McNamara served .