lord high fixer

from Jargon File (4.4.4, 14 Aug 2003)

lord high fixer
 n.

   [primarily British, from Gilbert & Sullivan's `lord high executioner']
   The person in an organization who knows the most about some aspect of
   a system. See {wizard}.

from The Free On-line Dictionary of Computing (8 July 2008)

lord high fixer

   [Primarily British, from Gilbert & Sullivan's "Lord High
   Executioner"] The person in an organisation who knows the most
   about some aspect of a system.  See {wizard}.

   [{Jargon File}]

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