He established the Young Korean Academy (흥사단; 興士團) in San Francisco in 1913 and was a key member in the founding of the Provisional Government of the Republic of Korea in Shanghai in 1919.
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While living in San Francisco, California, he witnessed two Korean Ginseng merchants fighting in the streets over sales turf.
In 1954, Jang established the Dae-Sung school in Wonju in order to pass on the teachings of An Chang-ho, and participated in the One World Movement, comparing notes with Albert Einstein.
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