RSA 294-A:19: Voting of Shares.

No proxy for shares of a professional corporation shall be valid unless it is given to a qualified person. A voting trust with respect to shares of a professional corporation shall not be valid unless all the trustees and beneficiaries of the voting trust are qualified persons, except that a voting trust may be validly continued for a period of 10 months after the death of a deceased beneficiary or for a period of 5 months after a beneficiary has become a disqualified person.