The New England Journal of Medicine (or NEJM) is a medical journal published by the Massachusetts Medical Society. As the medical journal with the longest continuous publication record, it is considered an elite (first tier) journal.1)
Eric Rubin MD PhD is the editor-in-chief. He is also a voting member of the Federal Drug Administration (FDA) Advisory Committee (FDA). On the question of whether it is safe to vaccinate 5-11 year olds with the Pfizer vaccine:
The NEJM has been the center of numerous publishing controversies during the COVID-19 pandemic.