UNITY — The superintendent of Regional School Unit 3 has resigned his position just three days into the school year, the chairwoman of the school board announced Friday.

Charles Brown, the superintendent of the school district for the last four years, resigned as of Thursday, board Chairwoman Ellie Hess said in a statement to parents and others in the district.

“We wish him the best as he explores new opportunities and continues to advocate for the educational needs of our youth,” Hess said in the statement.

She later said by phone that she couldn’t elaborate on the statement or give a reason for his departure because it’s a private, personnel matter. Another school board member, Najean Shedyak, also declined to comment for the same reason.

Brown was the principal of Mount View Elementary School in Thorndike for two years prior to becoming superintendent.

Hess said Lisa Roux, who’s the principal of four schools in the district, will temporarily assume Brown’s duties in a part-time capacity. Roux is the principal of the primary schools in Brooks, Liberty, Monroe and Troy.

The school board intends to have an interim superintendent in place at some point this month who would then serve until the end of the school year, Hess said in the statement.

The intention is to create a search committee early in the new year that will be charged with finding a permanent superintendent who would begin work in July, she said.

“Our central focus is to find what is best for our children,” Hess said.