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As the Sassafras Riverkeeper since 2018, Zack is the primary spokesperson for the Sassafras River and the Bayside Creeks and uses advocacy, outreach, restoration, and education to be a voice for the river, its natural resources, and its inhabitants. He is a vigilant, on-the-water presence working with local communities to achieve a healthier Sassafras, tackling issues including the Conowingo Dam, invasive water chestnuts, and harmful algal blooms using science-based solutions. 

A native Marylander, Kelleher’s conservation ethic and love of the Chesapeake Bay comes from the time he spent growing up outside of Tilghman Island. There, he learned to appreciate the rich cultural heritage and the immense beauty of the Eastern Shore while hunting, fishing, and crabbing on Harris Creek and the Choptank and Miles Rivers. Kelleher graduated from the University of Maryland with degrees in psychology and sustainability. He also holds a USCG Masters 25 Ton Captains License.