The stories range from the mid-1980s all the way up to last year and range from sexual abuse to inappropriate touching, with one of the women stating that she had known the elder Horovitz since she was 11-years old and considered him to be an honorary grandfather while another was Adam Horovitz's high school girlfriend.
And the celebrated writer's son isn't defending him.
"I believe the allegations against my father are true", Horowitz told the New York Times in a statement.
"Most of the women said they repeatedly told Horovitz to stop, in one case resorting to physical violence", the now-defunct alternative weekly newspaper said. Jocelyn Meinhardt, then 19, recalled the beginning of her 1989 summer internship at the Gloucester Stage Company in MA - where Horovitz was artistic director - when the playwright drove her to the family home her first night, locked the door and kissed and fondled her as she began to cry.
The first night, she alleged, Israel drove her to his family home in his convertible.
Israel, now 78, responded to the allegations, saying he has "a different memory of some of these events, I apologize with all my heart to any woman who has ever felt compromised by my actions, and to my family and friends who have put their trust in me".
Kim Senko, who worked as a technical director in a Horowitz' production in 1990, said in the report that Horovitz pushed her against a wall and shoved his hand down her trousers while pressing his mouth on hers. Gloucester Stage's president, Elizabeth Neumeier, also apologized to all of Horovitz's victims.
The women came forward to the New York Times, speaking on the record about allegations that stretch back to 1986, and one of which occurred as recently as a year ago. His play Out of the Mouths of Babes ran Off-Broadway a year ago, along with Man in Snow, which debuted at La MaMa Off-Off-Broadway last fall.
Horovitz has written and directed more than 50 plays including Park Your Car In Harvard Yard and Line.
The Boston Phoenix in 1993 that detailed allegations from multiple unnamed women of sexual harassment and assault.
She continued with an acknowledgment that women's accusations against Horovitz were "grossly mishandled" in the past and said the board will "take any reports seriously". She began to cry.