Academic publisher Sage has retracted eight articles co-authored by a “rising star” professor who was dismissed by a Dutch university, after an investigation found that the papers had gone through a “compromised” peer review process.

The retractions involve articles published in the Group & Organization Management journal where Yannick Griep served as editor-in-chief from 2022 until 2026 while also appearing as an author on the eight papers.

Sage said it launched an investigation after concerns were raised by authors and former members of the journal’s editorial team and board.

“Because the peer-review process was administered by the former editor in chief, who is also a co-author of the articles, the objectivity of the peer-review process has been compromised,” Sage said in a publisher’s note.

Out of the eight papers published between 2024 and 2026, six were retracted at the request of the publisher, while two were taken down at the request of the co-authors, according to the notice.