Columbia University President Minouche Shafik resigned Wednesday after a brief, tumultuous tenure that saw the head of the prestigious New York university grapple with protests over the Israel-Hamas war and criticism over how the school handled divisions related to the conflict.

The school in upper Manhattan was roiled this year by student protests, culminating in scenes of police officers carrying zip ties and riot shields storming a building that had been occupied by pro-Palestinian protesters. Similar protests swept college campuses nationwide.

In addition to the protests, the school in July removed three deans, who have since resigned, after officials said they exchanged disparaging texts during a campus discussion about Jewish life and antisemitism. Shafik said in a July 8 letter to the school community that the messages were unprofessional and "disturbingly touched on ancient antisemitic tropes."

Shafik was also among the university leaders called for questioning before Congress earlier this year. She was heavily criticized by Republicans who accused her of not doing enough to combat concerns about antisemitism on Columbia's campus.

In her letter announcing her resignation, Shafik heralded "progress in a number of important areas" but lamented that her tenure had also been a "period of turmoil where it has been difficult to overcome divergent views across our community." In her statement, she acknowledged the campus protests factored into her decision to resign.

"This period has taken a considerable toll on my family, as it has for others in the community," Shafik wrote. "Over the summer, I have been able to reflect and have decided that my moving on at this point would best enable Columbia to traverse the challenges ahead."

Shafik said she will return to the United Kingdom to lead an effort by the foreign secretary's office reviewing the government's approach to international development and how to improve capability.

"I am very pleased and appreciative that this will afford me the opportunity to return to work on fighting global poverty and promoting sustainable development, areas of lifelong interest to me," she wrote. "It also enables me to return to the House of Lords to reengage with the important legislative agenda put forth by the new UK government."

The Board of Trustees announced that Katrina Armstrong, the CEO of Columbia University Irving Medical Center, agreed to serve as interim president. The board said Armstrong, who is also the executive vice president for the university's Health and Biomedical Sciences, "is the right leader for this moment."

Armstrong said she was "deeply honored" to be leading the university at a "pivotal moment for Columbia."

"Challenging times present both the opportunity and the responsibility for serious leadership to emerge from every group and individual within a community," Armstrong wrote. "This is such a time at Columbia. As I step into this role, I am acutely aware of the trials the University has faced over the past year."

Shafik was named president of the university last year and was the first woman to take on the role, and she was one of several women newly appointed to take the reins at Ivy League institutions.

She had previously led the London School of Economics and before that worked at the World Bank, where she rose through the ranks to become the bank's youngest-ever vice president. Shafik also worked at the United Kingdom's Department for International Development, followed by stints at the International Monetary Fund and the Bank of England.

At the time of Shafik's appointment, Columbia Board of Trustees chair Jonathan Lavine described her as a leader who deeply understood "the academy and the world beyond it."

"What set Minouche apart as a candidate," Lavine had said in a statement, "is her unshakable confidence in the vital role institutions of higher education can and must play in solving the world's most complex problems."