What was the profession of the pioneer of the great silk road? ?

Zhang Qian often referred to as the pioneer of the silk road.  He was a Chinese official and diplomat who served outside China as an imperial envoy to the world during the second imperial dynasty of china called the "Han dynasty". Zhang Qian also played a crucial role in the Chinese colonization.

sam houston basically made tx he fought for anrew lead troops in the battle of san jacinto and then became president and james polk