John Hays Hammond Sr.

Biography

John Hays Hammond Sr. was an accomplished mining engineer whose expertise helped unlock mineral wealth while promoting responsible development. He looked beyond immediate gain to consider how practices could be improved for the benefit of communities and future generations.

Hammond’s deep knowledge of geology and engineering made him a trusted advisor to both industrial leaders and civic planners, and his legacy includes support for education and scientific study. His life is honored at Green-Wood Cemetery, where his dedication to both industry and public service is remembered.