Koo Cheng-yun (; 28 November 1954 – 23 January 2017), also known by his English name Leslie Koo, was a Taiwanese business executive and billionaire who served as Chairman of Taiwan Cement Corporation. He was the second son of the prominent businessman and diplomat Koo Chen-fu, and a member of the Lukang Koo clan, one of the five wealthiest families of Taiwan.
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