Cornell University has launched an investigation into the work of Brian Wansink, the food behavior and marketing expert who has come under fire for scientific misconduct allegations over the last year, BuzzFeed News has learned.

“An internal investigation by the University is underway, in compliance with our internal policies and any external regulations that may apply,” Vice President for University Relations Joel Malina said by email on Tuesday.

The school declined to share any more details, including exactly when the investigation began, how many papers are being reviewed, or whether the investigation involves the federal Office of Research Integrity.

It’s not the first time Cornell has looked into Wansink: In April, after critics publicly questioned four of Wansink’s papers related to pizza consumption, the university said it had found no scientific misconduct related to those papers.

Wansink did not immediately return a request for comment about the investigation.

Overall, critics have raised red flags about at least 50 of Wansink’s studies. The high-profile professor has retracted four articles — most recently one last week — and has at least eight corrections published or forthcoming. (That total doesn’t include yet another problematic paper about vegetable-naming that stands to be corrected or withdrawn.)