Hamilton County uses a 9-1-1 Advisory board but to my knowledge they do not play direct role in the decision making process... The Hamilton County Communications Center is supervised by a Department Director who is appointed by the County Commissioners and as of January 2012 they are no longer under the wing of the Sheriff's Office. With the impending dispatch consolidation there will be an "advisory board" consisting of appointed personnel from the user agencies that will contribute to the decision making process but will still be under the ultimate control of the HC Board of Commissioners.
(This is what we've been told (as dispatchers) and this information is subject to change (likely daily...))