The report also said the school had used “the concept of in loco parentis,” or its responsibility to stand in for students’ parents, “as both a sword and shield to excuse behavior that crossed boundaries with students and allowed sexual misconduct to take place.”

The investigation, which was conducted by the international law firm Locke Lord, documented sexual abuse by seven former faculty members that occurred between 1969 and 1992, which “primarily involved unwanted sexual contact and intercourse.”

Investigators also received “highly credible” allegations against three adults who had been members of the Hotchkiss community, including former faculty members and the spouse of a faculty member. Some of the former faculty members went on to teach or work with children elsewhere.

One teacher, Leif Thorne-Thomsen, who was a classics teacher from 1964 to 1992, abused multiple students over the course of years, according to the report — it includes the accounts of seven women who said they were sexually abused by him. The report described his relationship with one former student in particular as “emotionally coercive.” When the student told Mr. Thorne-Thomsen she was having issues with her father, he replied, “I will be your father.”

One woman’s parents found her staying in a hotel with Mr. Thorne-Thomsen the summer after she graduated, and told the headmaster and the chairman of the school’s board of trustees about the discovery. Mr. Thorne-Thomsen was placed on a paid leave of absence and then allowed to return the following year. The letter offering him his job back spoke of his having “the most honorable and most open intentions.”