Question:
Pieter Cornelis "Piet" Mondriaan, after 1906 Mondrian (; Dutch: ['pit 'mondrija:n], later ['mondrijan]; 7 March 1872 - 1 February 1944), was a Dutch painter and theoretician who is regarded as one of the greatest artists of the 20th century. He is known for being one of the pioneers of 20th century abstract art, as he changed his artistic direction from figurative painting to an increasingly abstract style, until he reached a point where his artistic vocabulary was reduced to simple geometric elements. Mondrian's art was highly utopian and was concerned with a search for universal values and aesthetics. He proclaimed in 1914: Art is higher than reality and has no direct relation to reality.
Unlike the Cubists, Mondrian still attempted to reconcile his painting with his spiritual pursuits, and in 1913 he began to fuse his art and his theosophical studies into a theory that signaled his final break from representational painting. While Mondrian was visiting the Netherlands in 1914, World War I began, forcing him to remain in there for the duration of the conflict. During this period, he stayed at the Laren artists' colony, where he met Bart van der Leck and Theo van Doesburg, who were both undergoing their own personal journeys toward abstraction. Van der Leck's use of only primary colors in his art greatly influenced Mondrian. After a meeting with Van der Leck in 1916, Mondrian wrote, "My technique which was more or less Cubist, and therefore more or less pictorial, came under the influence of his precise method." With Van Doesburg, Mondrian founded De Stijl (The Style), a journal of the De Stijl Group, in which he first published essays defining his theory, which he called neoplasticism.  Mondrian published "De Nieuwe Beelding in de schilderkunst" ("The New Plastic in Painting") in twelve installments during 1917 and 1918. This was his first major attempt to express his artistic theory in writing. Mondrian's best and most-often quoted expression of this theory, however, comes from a letter he wrote to H. P. Bremmer in 1914:  I construct lines and color combinations on a flat surface, in order to express general beauty with the utmost awareness. Nature (or, that which I see) inspires me, puts me, as with any painter, in an emotional state so that an urge comes about to make something, but I want to come as close as possible to the truth and abstract everything from that, until I reach the foundation (still just an external foundation!) of things...  I believe it is possible that, through horizontal and vertical lines constructed with awareness, but not with calculation, led by high intuition, and brought to harmony and rhythm, these basic forms of beauty, supplemented if necessary by other direct lines or curves, can become a work of art, as strong as it is true.
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Did he have any influences?

Answer:
Van der Leck's use of only primary colors in his art greatly influenced Mondrian.

Answer the question at the end by quoting:

Sven Anders Hedin, KNO1kl RVO, (19 February 1865 - 26 November 1952) was a Swedish geographer, topographer, explorer, photographer, travel writer, and illustrator of his own works. During four expeditions to Central Asia, he made the Transhimalaya known in the West and located sources of the Brahmaputra, Indus and Sutlej Rivers. He also mapped lake Lop Nur, and the remains of cities, grave sites and the Great Wall of China in the deserts of the Tarim Basin. In his book Fran pol till pol (From Pole to Pole), Hedin describes a journey through Asia and Europe between the late 1880s and the early 1900s.
Hedin's conservative and pro-German views eventually translated into sympathy for the Third Reich, and this would draw him into increasing controversy towards the end of his life. Adolf Hitler had been an early admirer of Hedin, who was in turn impressed with Hitler's nationalism. He saw the German leader's rise to power as a revival of German fortunes, and welcomed its challenge against Soviet Communism. He was not an entirely uncritical supporter of the Nazis, however. His own views were shaped by traditionalist, Christian and conservative values, while National Socialism was in part a modern revolutionary-populist movement. Hedin objected to some aspects of National Socialist rule, and occasionally attempted to convince the German government to relent in its anti-religious and anti-Semitic campaigns.  Hedin met Adolf Hitler and other leading National Socialists repeatedly and was in regular correspondence with them. The politely-worded correspondence usually concerned scheduling matters, birthday congratulations, Hedin's planned or completed publications, and requests by Hedin for pardons for people condemned to death, and for mercy, release and permission to leave the country for people interned in prisons or concentration camps. In correspondence with Joseph Goebbels and Hans Drager, Hedin was able to achieve the printing of the Daily Watchwords year after year.  The Nazis attempted to achieve a close connection to Hedin by bestowing awards upon him. They asked him to present an address on Sport as a Teacher at the 1936 Summer Olympics in Berlin's Olympic stadium. They made him an honorary member of the German-Swedish Union Berlin (German: Deutsch-Schwedischen Vereinigung Berlin e.V.) In 1938, they presented him with the City of Berlin's Badge of Honor (German: Ehrenplakette der Stadt Berlin). For his 75th birthday on 19 February 1940 they awarded him the Order of the German Eagle; shortly before that date it had been presented to Henry Ford and Charles Lindbergh. On New Year's Day 1943 they released the Oslo professor of philology and university rector Didrik Arup Seip from the Sachsenhausen concentration camp at Hedin's request in order to obtain Hedin's agreement to accept additional honors during the 470th anniversary of Munich University. On 15 January 1943, he received the Gold Medal of the Bavarian Academy of Sciences (Goldmedaille der Bayerischen Akademie der Wissenschaften). On 16 January 1943 he received an honorary doctorate from the faculty of natural sciences of Munich University. On the same day, the Nazis founded in his absence the Sven Hedin Institute for Inner Asian Research located at Mittersill Castle, which was supposed to serve the long-term advancement of the scientific legacy of Hedin and Wilhelm Filchner as Asian experts. However, it was instead misused by Heinrich Himmler as an institute of the Research Association for German Genealogical Inheritance (Forschungsgemeinschaft Deutsches Ahnenerbe e.V.). On 21 January 1943, he was requested to sign the Golden Book of the city of Munich.  Hedin supported the Nazis in his journalistic activities. After the collapse of Nazi Germany, he did not regret his collaboration with the Nazis because this cooperation had made it possible to rescue numerous Nazi victims from execution, or death in extermination camps.

Did he know Hitler?
Hedin met Adolf Hitler and other leading National Socialists repeatedly and was in regular correspondence with them.