About Us The Law Office of Delmas A. Costin, Jr. proudly represents parties in employment discrimination matters, labor-management disputes, and immigration. Attorney Delmas Costin began his legal career serving as an Assistant District Attorney in the Office of the Bronx District Attorney. He was the primary prosecutor in dozens of trials and proceedings during his 6-year tenure, and gained the experience needed to win dozens of cases since then. Call for your free legal consultation today.