SOUTH THOMASTON, Maine — The town’s sole representative to the Regional School Unit 13 board resigned Friday, following weeks of closed-door meetings to try to hire a new superintendent.

Dr. Eric Schenk of South Thomaston confirmed Friday that he had resigned effective immediately.

Schenk said he was disillusioned with the divisiveness on the school board during the superintendent search but stressed he was not being critical of the other members.

“I have a lot of respect for everyone as they represent their towns. I just feel I haven’t been able to be effective and make meaningful changes that I had wanted,” Schenk said.

Schenk was elected at the March 2011 town meeting, defeating then-Board Chairwoman Ruth Anne Hohfeld. His term would have run through the March 2014 town meeting.

Schenk notified both RSU 13 board Chairwoman Esther “Tess” Kilgour and Jeff Northgraves, the chairman of the South Thomaston Board of Selectmen. The selectmen have the authority to appoint a successor until the next town meeting.

South Thomaston has one member on the 12-member RSU 13 board, which also represents Rockland, Thomaston, St. George, Owls Head and Cushing.

Kilgour praised Schenk upon learning of his decision Friday.

“He was an asset to the board. He will be missed,” she said.

The board has been working since December to find a new superintendent. The board is scheduled to meet next on Monday evening at 6 to continue its superintendent search. Kilgour said Tuesday that a fourth candidate will be interviewed.