From Longman Dictionary of Contemporary Englishgatekeepergate‧keep‧er /ˈɡeɪtˌkiːpə $ -ər/ noun [countable] 1 BODHsomeone whose job is to open and close a gate, and to allow or not allow people to go through it2 someone in an organization who has a lot of influence over what products the organization buys, who it buys them from etc3 someone in an organization who tells customers or people with questions which people in the organization should be able to help them
Examples from the Corpus
gatekeeper• These conglomerates are the media gatekeepers that wield extraordinary power over the ideas and information the public receives.• Many of these are technology gatekeepers, and are referred to as consultants.• Law schools are the gatekeepers of the profession.• An offering for the gatekeeper of hell.• The groom should then pay the gatekeeper a token gift to allow the procession to pass.• The seasons, the gatekeepers of Olympus, stood waiting to fling the doors wide.• Looking back he saw that she was pleading with the gatekeeper, who continued to shake his head.From Longman Business Dictionarygatekeepergate‧keep‧er /ˈgeɪtˌkiːpə-ər/ noun [countable]1MARKETING someone in an organization who has a lot of influence over which products it buys, which company it buys them from etcFor technology gatekeepers, the challenge is to keep ahead of new computer developments.2informalJOB someone in an organization who decides who should deal with particular enquiries and customers. Gatekeepers may also restrict who is allowed to talk to certain people in the organizationThe receptionist has an important role to play as the firm’s gatekeeper. 