GBH is an American public broadcasting group based in Boston, Massachusetts. Founded in 1951, it is owned by the state and operates as a non-profit organization. GBH holds the licenses to all of the PBS member stations in Massachusetts, including its flagship station WGBH-TV, sister station WGBX-TV, and a group of NPR member stations in the state. With approximately 1290 employees, GBH is one of the largest public broadcasting organizations in the United States.