Jean Gebser (; August 20, 1905 as Hans Karl Hermann Rudolph Gebser – May 14, 1973) was a Swiss philosopher, linguist, and poet who described the structures of human consciousness. Biography Born Hans Karl Hermann Rudolph Gebser in Posen in Imperial Germany (now Poland), he left Germany in 1929, living for a time in Italy and then in France. He then moved to Spain, mastered the Spanish language in a few months and entered the Spanish Civil Service where he rose to become a senior official in the Spanish Ministry of Education. His father was lawyer Frederich Gebser and mother was Margaretha Grundmann. Cousin of World War 1 era chancellor Theobald Von Bethmann Hollweg. Before the Spanish Civil War began, he moved to Paris, and then to Southern France. It was here that he changed his German first name "Hans" to the French "Jean." He lived in Paris for a while but saw the unavoidability of a German invasion. He fled to Switzerland in 1939, escaping only hours before the border was closed. He spent the rest of his life near Bern, where he did most of his writing. Even late in life, Gebser travelled widely in India, the Far East, and the Americas, and wrote half a dozen more books. He was also a published poet. Gebser died in Wabern bei Bern on May 14, 1973 "with a soft and knowing smile." His personal letters and publications are held at the Gebser Archives at the University of Oklahoma History of Science Collections, Norman, Oklahoma, Bizzel Libraries. Consciousness in transition Gebser's major thesis was that human consciousness is in transition, and that these transitions are "mutations" and not continuous. These jumps or transformations involve structural changes in both mind and body. Gebser held that previous consciousness structures continue to operate parallel to the emergent structure. Consciousness is "presence", or "being present": Each consciousness structure eventually becomes deficient, and is replaced by a following structure. The stress and chaos in Europe from 1914 to 1945 were the symptoms of a structure of consciousness that was at the end of its effectiveness, and which heralded the birth of a new form of consciousness. The first evidence he witnessed was in the novel use of language and literature. He modified this position in 1943 so as to include the changes which were occurring in the arts and sciences at that time. His thesis