The Darien public school district has appointed Adam Schoenbart, an instructional technology coach at Ossining High School in New York as an assistant principal at Darien High School. He replaces Michael Sullivan. Schoenbart has been instructional technology coach since 2015 and before that taught English at the Ossining, N.Y. high school. In 2016, the National School Board Association named him one of the “20 to Watch” education technology leaders. He was approved for the Darien position by the Board of Education in a special meeting on Friday, Aug.