Simon Bramhall, 53, has pleaded guilty to assault of two patients, for, yes, branding his initials onto their organs during surgery. He is going to be sentenced on Jan. 12.

The Associated Press reports that a prosecutor called the case “without legal precedent in criminal law.”

“Bramhall used an argon beam coagulator, which seals bleeding blood vessels with an electric beam, to mark his initials on the organs,” the AP writes.