The superintendent of the Robstown Independent School District has resigned his position.

School officials confirmed on Wednesday that Superintendent Alfonso Obregon presented his letter of resignation to school board members following a scheduled meeting Tuesday night. In his letter to trustees, a copy of which was provided to The Nueces County Record Star, Obregon said he would be stepping down in June in order to allow the district adequate time to find his replacement.

"As of today, many positive changes have occurred during my two-year tenure at Robstown ISD that I know will impact student performance for years to come," Obregon wrote. "None of these actions could have occurred without your total support in promoting a good educational system for our students, and the community who we serve."

On Wednesday, Obregon said he felt that he had accomplished what he had set out to do when he accepted the position two years ago, and that was foster a sense of change within the district in how to improve instruction and leadership at the campus level.

"My mission there is finished," he said. "I think it's time someone else take over and continue the work."

The board must still formally accept Obregons's resignation, which it will likely do at its January meeting.

Obregon has been the district's leader since Nov. 2009, when he took over for Interim Superintendent Tony Morales.