In 1862, as Clerk of the House, Campbell was called as a witness in the Supreme Court case Busby vs Bell, in which former British Resident James Busby sued for libel Francis Dillon Bell (as Land Claims Commissioner).
Another role that Campbell fulfilled while holding the office of Clerk of the House was that of Presiding Officer to receive nominations and count votes for the first Board of Directors of The New Zealand Government Life Insurance Association when it was established on 1 January 1885 [REF].