Dean Paul Weil's resignation was accepted Thursday night by the District 125 School Board, multiple media outlets have reported.
NBC 5 reported that Weil submitted a resignation letter Wednesday. He had worked at the school for 13 years, serving as dean since 2008.
Stevenson spokesman Jim Conrey told the Chicago Tribune that it was "an unfortunate way to end" Weil's tenure.
The resignation was accepted as police investigate reports that an administrator, now identified as Weil, . The Tribune reported that the messages were received by a student.
Stevenson students have been discussing the situation since Monday on Twitter, with some expressing surprise and disappointment.
"Truth, Dean Weil had qualities most of the administration lacks: #fairness #empathy #likeability," one person Tweeted.
Previously on Buffalo Grove Patch: