“We owe it to the courageous survivors and the entire Columbia community to fully reckon with Hadden’s abuses,” said Minouche Shafik, president of Columbia University, and Dr. Katrina Armstrong, chief executive officer of the medical center, in the release.

“Columbia failed these survivors, and for that we are deeply sorry,” they added. “This announcement aims to ensure we are on a path that repairs harm and prevents further trauma — moving us forward and rebuilding the trust of our entire community.”

The university also announced that it had developed a series of new patient safety policies and programs, including the creation of a center focused on quality care and patient safety.

Mr. Hadden was first arrested while he was still working at Columbia University and its affiliated hospitals. He pleaded guilty in state court to a single felony count of a criminal sexual act in the third degree and a misdemeanor count of forcible touching, but was spared prison time as part of a plea deal.

According to prosecutors and witnesses, reports of Mr. Hadden’s abuse go as far back as two decades, to his early years of working at the university’s hospital. During that time, he honed methods of seeing patients alone during examinations to assault them, prosecutors said. Warnings and reports of his inappropriate behavior and assaults were not acted on by hospital administration, the authorities said.