Chief Mann has been the Turtle Clan Chief of the Ramapough Lenape Nation, which encompasses Passaic County, NJ, Warwick, NY and surrounding areas, for approximately twelve years. He is one of the founders of a natural growing farm known as the Munsee Three Sisters Medicinal Farm, which was created to assist the Turtle Clan realize food sovereignty and a resource for clean and healthy food.
He received the Russ Berry Foundation’s highest award for being an Unsung Hero for his people, specifically for his efforts to bring to light the health ramifications and the decades long struggle after the Ford Toxic dumping. In 2016, he was asked to speak at a forum at the University of Dayton Ohio on the effects of toxic dumping on his people. Chief Mann also engages with Ramapo College’s Environmental Master’s Program on the topics of pipelines and environmental justice. In February 2020, Chief Mann was the Keynote speaker for the Watershed Conference held on the Delaware River in Lambertville NJ.
Chief Mann has been working with NYU Environmental for the past 5 years, 2 years of which were spent creating a community health survey to address the health concerns of his community. He continues to work with NYU to date.
Chief Mann has begun the process of rebuilding the community of one of the two Churches the Ramapough communities attend. The church is listed on the National Historic Registry as a Historic Native American Church and was founded by Samuel Defreese, a Ramapough.
With long-term goals of cultural restoration, Chief Mann is currently working on co-creating the United Lunaapeewak. This project will also provide an educational aspect for the greater citizens of NJ and Southern NY. In addition, he is working with the Rutgers Newark Price Institute and Rutgers New Brunswick on a book entitled “Our Land Our Stories.”
Chief Mann is often asked to give Land Acknowledgments throughout NJ as well as NYC honoring his ancestors as well as all his relations.
He became a trustee of the New Jersey Highlands Coalition in 2020 after serving on the Legacy Council. As a former member of the Ringwood mines superfund site’s Citizen Advisory Group (CAG), Chief Mann has been at the forefront of protecting 4 million peoples drinking water. As an advocate for cultural and environmental issues he continues to this day to work tirelessly for humanity and for our natural environment.