NEW YORK (AP) — In a story April 23 about a gender bias lawsuit, The Associated Press erroneously reported the name of a Columbia University spokesman. He is Robert Hornsby, not Roger Hornsby.

A corrected version of the story is below:

Columbia student alleges gender bias after rape claim tossed

Lawsuit: Columbia University supports student's public shaming after rape claim was rejected

By LARRY NEUMEISTER

Associated Press

NEW YORK (AP) — A Columbia University student sued the school Thursday, saying it failed to protect him against harassment when a female student went public with claims he raped her after school and law enforcement authorities rejected her case.

The lawsuit was filed in Manhattan federal court by Paul Nungesser, a German citizen who said onetime friend Emma Sulkowicz has repeatedly and publicly called him a "serial rapist," resulting in national and international media attention.

Defendants include the school, its board of trustees, President Lee C. Bollinger and Professor Jon Kessler. The lawsuit sought unspecified damages.

"Columbia University's effective sponsorship of the gender-based harassment and defamation of Paul resulted in an intimidating, hostile, demeaning ... learning and living environment," the lawsuit said.

Robert Hornsby, a Columbia spokesman, said the school had no comment. Email messages requesting comment from Bollinger and Kessler were not immediately returned. The suit was filed three days after a judge tossed out another gender-based lawsuit brought by a male student against Columbia University.

In his lawsuit, Nungesser said a Columbia-owned website had presented as fact that he sexually assaulted Sulkowicz, a senior majoring in visual arts. It said that the school allowed Sulkowicz to carry a mattress into classes, the library and campus-provided transportation as part of her senior thesis, that Kessler approved the "Mattress Project" for her course credit and that Sulkowicz's pledge to carry her mattress to graduation may prevent Nungesser and his parents, who'd like to fly from Germany, from participating in graduation ceremonies.

"Day-to-day life is unbearably stressful, as Emma and her mattress parade around campus each and every day," the suit said.

As a result of publicity that resulted in media reports in 35 countries, the lawsuit said, Nungesser "has been subjected to severe, pervasive ... and threatening behavior by other Columbia students, believing that Paul is a 'serial rapist,' whenever Paul has appeared at university activities."

The complaint also said he wants to stay in the United States, where he has been dating a girlfriend for over a year, and is seeking consulting work in New York, though job prospects have been "severely jeopardized" by the school's support of Sulkowicz.

In an email responding to a request for comment, Sulkowicz wrote: "I think it's ridiculous that Paul would sue not only the school but one of my past professors for allowing me to make an art piece.

"It's ridiculous that he would read it as a 'bullying strategy,' especially given his continued public attempts to smear my reputation, when really it's just an artistic expression of the personal trauma I've experienced at Columbia. If artists are not allowed to make art that reflect on our experiences, then how are we to heal?"

Sulkowicz has argued her case was badly mishandled by the school disciplinary panel after she reported in 2013 she was raped in her dorm months before. She was among 23 students who sued Columbia last year, saying it mishandled sexual assault cases. She also attended President Barack Obama's State of the Union address in January at the invitation of Sen. Kirsten Gillibrand, D-N.Y.

The Associated Press normally does not identify people claiming they were sexually assaulted, but makes exceptions when the alleged victim has spoken publicly on the subject.

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Associated Press writer Colleen Long contributed to this story.