A U.S. researcher who co-authored controversial papers on stem cell development will quit his post at Brigham and Women's Hospital in Boston on Sept. 1, the institution said Tuesday.

Charles Vacanti, chairman of the hospital's Department of Anesthesiology, Preoperative and Pain Medicine, was involved in the publication by a Japanese institution of two theses on so-called STAP cells whose credibility came into question earlier this year.

Vacanti, known as a mentor of Haruko Obokata at the Japanese government-affiliate Riken institute who is a key author of the papers, will remain on faculty, the Boston hospital said.