The attorney-client privilege is the oldest privilege for confidential information recognized at common law. Corporate-Attorney Client Privilege.Is the Attorney Investigator Acting in the Capacity of an Attorney? This article explores those cases and suggests best practices for companies to follow to protect communications between employees regarding legal matters. Where inhouse counsel acts as a business person or a lobbyist, for example, privilege will not lie. The attorney-client privilege extends to clients, clients' representatives, lawyers and lawyers' representatives—the circle of trust. Jonathan D. Baughman is a partner in the Houston office of McGinnis, Lochridge and Kilgore, LLP. When it comes to pre-advice communications between non-attorney employees, the question is one of privilege. Calendar invites to meetings and teleconferences can be used to identify attorneyclient privilege prior to the meeting occurring.