What is "riverkeeper"

n. A person responsible for the maintenance and upkeep of a river.

Riverkeeper is an environmental non-profit membership organization dedicated to the protection of the Hudson River and its tributaries, as well as the watersheds that provide New York City with its drinking water. It was the first "keeper" to be founded; today, there are over 150 "keepers" around the globe, all members of the Waterkeeper Alliance umbrella organization. Paul Gallay is the Executive Director and the current Riverkeeper, while Robert F. Kennedy, Jr. is the Vice Chair and Chief Prosecuting Attorney for Riverkeeper.