No trustee of any public institution of higher education operated by the commonwealth shall be eligible to be appointed to or hold any other office or position with said institution for a period of three years next after the termination of his services as such trustee, or in the case of an elected student trustee at said institution, for a period of one year next after the termination of his services as such trustee; provided, however, that any such elected student trustee may accept and hold part-time employment at said institution while a student thereat, and provided further, that a trustee may be appointed to or hold an unpaid office or position with said institution after his services as such trustee.
Mass. Gen. Laws ch. 268A, § 23A