What he called a “lack of integrity” in the process of renewing a teacher’s contract prompted the resignation of Boyd Kronholm this week. Kronholm, who was serving his second three-year-old term on the Greenville School Committee, said he felt there were problems with the dual relationship of Bob Hamer, board chairman, which resulted in a conflict of interest. Hamer also is the executive director of the Moosehead Lake Region Chamber of Commerce and has employed Elisabeth Martin, fiancee of Greenville Superintendent Steven Pound, at the Chamber office. When Martin, whose continuing contract as a Greenville High School teacher was up for action on May 11, Hamer did not abstain from the vote, Kronholm said. The vote on her continuing contract was 3-2.