Ko-Eun Song has taught and developed materials for Practical English, English for Professional Track and Communication in English at Chung-Ang University for almost two decades. She has taught Business English and developed materials for companies such as Samsung SDS, Samsung Electro-Mechanics Co., Ltd., Hansol Paper Co., Ltd., Hanjin Shipping Co. KAIST Researchers, Elite Korea Job English, VERITAS Law School Civil Service Examination English, TOEIC, Business English in BCM and YBM. Ko-Eun Song is also the Director of the Korean Association of Negotiations.