Mass. Gen. Laws ch. 34A, § 17
(A.) Form of Government.
(ii) Elected officers; governing body defined; exercise of administrative or executive functions by county executive.
(b) In each county operating under this section the term ''governing body'' of the county shall be construed to include both the commissioners and the county executive. For the purpose of the construction of any applicable law, any and all administrative or executive functions heretofore assigned by general law to the commissioners shall be exercised by the county executive, and any and all legislative and investigative functions heretofore assigned by general law to the commissioner shall be exercised by the board.
(B.) County Executive.
(iv) The executive power of the county shall be exercised by the county executive. He shall:
(v) The county executive:
(g) Shall approve each ordinance of the board of commissioners by signing it, or may veto any ordinance by returning it to the clerk of the board within ten days of passage with a written statement of his objections to the ordinance. If two-thirds of the full membership of the board, upon reconsideration of the measure, shall vote for it, the executive's veto shall be overridden and the ordinance shall become law without the executive's signature in accordance with the provisions of law.
(C.) Board of Commissioners.
(i) The legislative power of the county shall be vested in the board of commissioners. Such legislative power shall be exercised by ordinance, except for the exercise of the following powers which are required to be or are permitted to be, exercised by resolution:
(iv) The board of commissioners.
(g) Shall approve the annual operating and capital budgets, prior to presenting the budgets for advisory board appropriation.
(D.) Chief Administrator.
(ii) The chief administrator shall by education, experience and ability be qualified to perform the duties established for him.
He need not be a resident of the county at the time of his appointment, but during his tenure he may live outside the county only with the permission of the county executive.
(iii) The chief administrator shall be responsible only to the executive. He shall, under the direction and supervision of the executive, undertake to assist in the orderly and efficient administration of the county, performing whatever supervisory or administrative duties the executive deems necessary and proper.
Nothing in this section shall be deemed to prohibit the chief administrator's being appointed to head one or more departments on a temporary or permanent basis.