The head of NHS England, Jim Mackey, has declared that hospital trusts must be "more keen" to identify rogue surgeons and react more quickly to suspicions of patient harm[1]. His comments came in response to a report about orthopedic surgeon Yaser Jabbar of Great Ormond Street Hospital, whose treatment harmed almost 100 children[2][5]. Mackey criticized hospital boards for not being "curious enough" and too readily trusting surgeons' performance data without further investigation[1]. He said hospital executive teams should be "more willing to challenge" surgeons and GPs when there is suspicion of patient harm[1]. A report on Jabbar revealed that of the 789 children he treated, 94 children suffered harm, of which 36 cases were classified as "severe harm"[5]. NHS England has written to the Royal Colleges of Physicians to highlight "emerging evidence" of more widespread harm in surgical negligence[1].