As a former U.S. commerce secretary and two-term governor of Washington state, boosting trade and maintaining smooth relations between Washington and its biggest foreign creditor were seen as his priorities when he became ambassador.
Yet less than a year into his tenure, he was earning respect from the human rights lobby for his role in the drama over blind legal activist Chen Guangcheng, who escaped from house arrest, sought refuge in the U.S. Embassy in Beijing and later moved to New York. At one point, Locke was photographed holding Chen's hand as they entered a hospital.
He was popular among ordinary Chinese from day one, with a photo of him wearing a backpack and trying to use a coupon to buy coffee at Seattle airport widely posted on the Chinese Internet. It contrasted with Chinese bureaucrats, who have aides attend to such minor tasks.
He attracted overflowing audiences to his speeches at Chinese universities, and huge crowds showed up when he visited his ancestral home in the southeastern province of Guangdong.
Locke said U.S.-China relations continue to grow stronger despite a complex relationship. "I remain confident in the ability of our leaders to manage differences and increase cooperation in areas of mutual concern to the benefit of not just our two great peoples, but the entire world," he said.