From this perspective, Teewinot Mountain, the Grand Teton, and Mount Owen form the Cathedral Group. Fritiof Fryxell wrote in 1938 that these peaks show a Gothic note, from the profiles of countless firs and spruces on the lower slopes, to the converging lines of spire beyond spire, to the peaks themselves whose pointed summits lift vision and thought higher. Fryxell, Grand Teton National Park's first ranger naturalist, also served as a geologist, teacher, and mountaineer who developed public education programs, trail maps, and safety rules for climbers, and his publications became classics of explanation and eloquence. In 1929, Congress established Grand Teton National Park to protect the heart of the Teton Range, and in 1950 the park expanded with the addition of most of the valley called Jackson Hole.