Avram Mack #

Introduction #

Dr. Avram Mack is a Columbia-trained psychiatrist who resigned from Nemours Children’s Health in Delaware on the same day he took the witness stand for prosecutors in the Lindsay Clancy murder trial — one of the most closely watched criminal cases in the country. Mack, who had served as the health system’s chief of psychiatry, testified in the case against Clancy — accused of strangling her three young children in 2023 — that she showed no signs of the postpartum psychosis her defense invoked, but that question went to the jury. On Friday, August 28, 2026, Nemours confirmed that “Dr. Avram Mack is no longer employed by Nemours Children’s Health,” and declined to elaborate, saying only that “employment decisions are confidential.” Neither the hospital nor Mack has publicly explained the resignation or its timing.

Background Information #

Mack had been employed with Nemours Children’s Health in Delaware as chief of psychiatry since 2023, according to his LinkedIn profile as cited by the Daily Caller, which added that he had spent the previous ten years also serving as a professor of clinical psychiatry at the Perelman School of Medicine at the University of Pennsylvania. He stated during the trial that he was on retainer at the Plymouth County District Attorney’s Office, which was overseeing Clancy’s prosecution. The New York Post described him as Columbia-trained. Clancy, a former labor and delivery nurse, was charged with murder in the January 2023 deaths of her daughter Cora, 5, and sons Dawson, 3, and Callan, 8 months, in her Duxbury, Massachusetts home; her attorney has acknowledged she killed the children while arguing she acted in the grip of postpartum psychosis and should not be held criminally responsible.

The Controversy or Incident That Led to Their Cancellation #

Allegations. Nothing here is a finding against Mack: the cause of his departure has not been stated by Nemours or by Mack, nothing was adjudicated, and his trial testimony was expert opinion offered in a case that ended in a mistrial rather than a verdict.

Mack testified as a prosecution rebuttal witness in the Clancy trial, with his cross-examination ongoing on Monday, August 24, 2026 — the same day, the New York Post reported, that he resigned from Nemours. On the stand, Mack agreed that Clancy was “in a serious psychiatric state and she was suffering” on January 24, 2023, the day the children died — but ultimately testified that, in his opinion, she should be held criminally responsible for their deaths. Mack testified he had found no evidence “of psychotic features” in her record, that some of her reported thoughts — such as a fear her children would be taken from her — were “quite normal,” and that eight months had passed since her last child was born while the postpartum period is generally considered to last four to six weeks.

The examination grew contentious. Clancy’s attorney, Kevin Reddington — who had grilled Mack on whether she was psychotic at the time and noted Mack is a child psychiatrist — blasted the doctor for smirking during questioning. “What are you smiling for?” Reddington snapped. “This is not funny, sir.” The fiery exchange became one of the trial’s widely shared moments just as the jury began weighing whether Clancy could be held criminally responsible for her children’s deaths.

Public Reaction and Consequences #

Word that Mack was out of a job broke on Friday, August 28, as jurors ended their second day of deliberations without reaching a verdict. Nemours confirmed the departure that day, and the Daily Caller reported Mack was no longer listed on the hospital’s website; one parent who said their child was his patient reported receiving notice that his patients were “being moved to new providers” until a new psychiatrist within the practice was assigned. Asked that Friday whether he had heard Mack was no longer employed, Reddington turned to the camera and smiled before taking further questions, per CT Insider’s account in the Daily Caller report. Neither the Plymouth County District Attorney’s Office nor the University of Pennsylvania responded to the Daily Caller’s inquiries about whether Mack remained with them, and the New York Post reported Mack could not be reached.

Current Status #

Mack is no longer employed by Nemours Children’s Health, no longer listed on its website, and his patients have been reassigned within the practice. Beyond that confirmation, nothing about the departure has been made public: no successor was named in the coverage, and neither his former employer nor he has given a reason. The trial he testified in ended days later, on September 4, 2026, when Plymouth Superior Court Judge William Sullivan declared a mistrial after the jury reported it was deadlocked — leaving Clancy, who the Daily Caller reported faces life in prison without parole if convicted, neither convicted nor acquitted, with a retrial possible. Mack’s opinion was accordingly never adopted by any verdict.

Impact on Their Career/Life #

The resignation ended Mack’s tenure as chief of psychiatry at Nemours, a clinical leadership role he had held since 2023 alongside his faculty position at Penn’s Perelman School of Medicine — though neither institution has said whether the faculty role continues. Because the cause of his exit has not been disclosed, its professional consequences are hard to map — but the public record now permanently pairs his name with the Clancy trial, the prosecution’s retainer, and a fiery cross-examination that ended with a defense attorney snapping at him in open court. For a forensic psychiatrist, whose credibility is the currency of the trade, departing a job on the very day he gave contested expert testimony in a nationally famous murder case is the kind of fact every future courtroom opponent can cite — whatever the undisclosed reason behind it turns out to be.