In Andrews' 1926 book On the Trail of the Ancient Man, Henry Fairfield Osborn noted in the preface that the birthplace of modern humans would be found in Asia and that he had predicted it decades earlier even before the Asiatic expeditions were carried out. Another key proponent of the out of Asia theory of this era was William Diller Matthew who also took part in the Central Asiatic expeditions; Matthew was well known for his deeply influential 1915 article "Climate and evolution".[12] Matthew's theory was that climate change was how organisms came to live where we find them today in opposition to the theory of continental drift. His basic premise was that cyclical changes in global climate along with the prevailing tendency for mammals to disperse from north to south account for the odd geographic patterns of living mammals, he believed that humans and many other groups of modern mammals first evolved in the northern areas of the globe, especially central Asia because of the shifting climatic circumstances, Matthew firmly placed hominid origins in central Asia as he claimed that the high plateaux of Tibet was the forcing ground of mammalian evolution.[13]