The Grosvenor Teacher Fellow (GTF) program is a professional development opportunity made possible by a partnership between Lindblad Expeditions and National Geographic Education. The program is named in honor of Gilbert M. Grosvenor, Chairman Emeritus National Geographic Society and Education Foundation Board. It gives current K–12 classroom teachers and informal educators from the 50 U.S. states, Canada, the District of Columbia, and Puerto Rico the opportunity to extend Grosvenor’s legacy of excellence in geographic education. 

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https://www.nationalgeographic.org/newsroom/national-geographic-society-and-lindblad-expeditions-announce-11th-annual-class-of-grosvenor-teacher-fellows/