The Cambridge University professor accused of plagiarism and lying about his allegedly esteemed career resigned from the prestigious UK school Wednesday — as it launched an investigation into him.

Diversity posterboy Jason Arday, 41 — the youngest black man ever to hold a professorship at the lauded London university — insisted the sudden move should not “be mistaken for an acceptance of the narratives that have surrounded me,” as he blasted the bombshell claims.

“While criticism is an inevitable part of academic life, what I have experienced has gone far beyond scholarly disagreement,” he wrote in a post on the Good Law Project. “The relentless accusations, speculation and public commentary have taken a profound toll on me and on those I love.”

Arday, who said his resignation as a professor of sociology goes into effect immediately, faces investigation for allegedly lifting more than 100 passages in his dissertation and fudging his resume.

“[We have] begun an investigation following new information about Professor Arday’s academic qualifications and honorary appointments,” Cambridge University said in a statement Wednesday.

“Separately, there remains a number of ongoing complaints regarding academic misconduct, which are being handled in line with our Misconduct in Research policy,” it added.

The school has previously stood behind the professor, claiming he was a victim of a “vile campaign to undermine his credibility.”

Nathan Cofnas, a postdoctoral researcher at Ghent University in Belgium, published a Substack article last month detailing several examples in which Arday’s doctoral dissertation appeared to be plagiarized.

An analysis showed more than 100 passages in his thesis reportedly appeared to be similar to or lifted from the thesis of Brunel University student Paula Zwozdiak-Myers.

Arday then came under fire Tuesday for falsely claiming to have held three positions at academic institutions on his official biography page for Cambridge University.

Arday wrote in the bio that he’s a visiting professor at Ohio State University’s Office of Diversity and Inclusion — though the school’s DEI office closed last year and administrators reportedly said they have no record of him as an employee.

Arday also claims he works as a visiting professor in the University of Glasgow’s School of Education but the school said he hasn’t held that position since leaving for Cambridge.

“Jason Arday was employed as Professor of Sociology of Education at the University of Glasgow between 2021 and 2023. He left the University to take up his role as Professorial Chair at the University of Cambridge,” a University of Glasgow spokesperson told The Post.

Arday also listed working at Durham University in the Department of Sociology as an honorary professor, though he currently holds no “formal” position there, according to the outlet.

“After leaving Durham for another university, Jason had an unpaid academic association with Durham University in relation to ongoing project work,” a university spokesperson clarified to The Post. “This type of arrangement is standard practice in academia.”

Arday said his resignation from Cambridge was “simply the decision of someone who has reached the limits of what any person should reasonably be expected to endure.”

Arday — who says he’s autistic, epileptic and a former pro soccer player — admitted last week to a series of errors in his work, but has insisted he’s not a “liar and fantasist.” 

Arday has also been accused of lying about his seemingly unbelievable list of personal accomplishments.

They include “running 30 marathons in just 35 days,” raising millions of dollars for charity,  and playing professional soccer and snooker.

Arday has also said he has autism spectrum disorder and was nonverbal until age 11. He became Cambridge’s youngest black professor at age 37.