The Law Director shall prepare all contracts, bonds, and other instruments in writing in which the Municipality is concerned. He shall be the chief legal adviser of all offices, departments, commissions, boards, and agencies, and of all officers and employees of the Municipality in matters relating to their official powers and duties. He shall represent the Municipality in all legal proceedings. Further, it shall be his duty to perform all services incident to this office as may be required by statute, by this Charter, or by ordinance.