RFC Editor
The function that numbers RFCs, copy-edits them and makes sure they never change once published.
For almost thirty years the RFC Editor was effectively one man: Jon Postel, who looked after the series from the first documents in 1969, first at UCLA and later at ISI in Southern California. He assigned numbers, edited the prose and kept track of which document obsoleted which. After Postel died in 1998 his ISI colleagues carried on, and since 2010 the job has been done under contract for the IETF by a dedicated office.
The ground rule is that a published RFC is immutable. Mistakes go into a separate errata list or into a new RFC that explicitly replaces the old one — which is why there are more than nine thousand numbers but far fewer standards in force. The same office publishes a joke document every April 1st, such as RFC 1149 on IP over avian carriers. It has been implemented.