MIT
CTSS
the Plan 9
Bell Labs
Brian Kernighan
Dennis
Tom Van Vleck
Louis Pouzin
Tom Duff
Eric S. Raymond
Multics
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Tom Van Vleck, a Multics engineer, has also reminisced about the extension rc: "The idea of having the command processing shell be an ordinary slave program came from the Multics design, and a predecessor program on CTSS by Louis Pouzin called RUNCOM, the source of the '.rc' suffix on some Unix configuration files."[3]
As said here by Contributors to Wikimedia projects