In 2004 he chose to establish his own firm, The Law Offices of David A. Concha P.C. where he continues to pursue his passion for the law. A member of the American Immigration Lawyers Association and The National Immigration Project. David is also registered with the Chamber of Commerce of Spain, for his ability to conduct business in Spanish.

David often speaks on immigration issues to a variety of businesses and groups as well participating in a radio program on 1220 AM, on Wednesdays at 11:00 a.m. and on the internet, in Charlotte, North Carolina, serving the Hispanic community. He is a 2007 recipient of La Noticia Community Service Award for his work with the Hispanic community. David also taught a class on Immigration Law at Central Piedmont Community College.