La. Stat. tit. 23 § 1304
Any notice or claim under this Chapter shall be given to the employer. If the employer is a partnership, then notice may be given to any one of the partners. If the employer is a corporation, then the notice may be given to any agent of the corporation upon whom process may be served or to any officer or agent in charge of the business at the place where the injury occurred. If the employer is a body politic, then the notice or claim for compensation may be given to the person connected with the body politic upon whom process may be served; however, in any case, the notice may be given to the person designated in the notice posted in accordance with R.S. 23:1303. Any such notice shall be given by delivering it or by sending it by certified mail, return receipt requested, addressed to the employer or officer or agent at his or its last known residence or place of business.
La. R.S. § 23:1304