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John (Jahyoung) Koo has a diverse work experience spanning several companies and roles. John (Jahyoung) began their career at LG CNS in 1999, working as a Software Research Engineer. During their time there, they were involved in various projects such as the TTS System, UMS (Unified Messaging System), and CRM. John (Jahyoung) also worked with XMNet, an in-company venture. In 2001, Koo joined LG Electronics as Chief Research Engineer, where they remained until 2014. In this role, they contributed to the company's research efforts. In 2007, Koo pursued a Ph.D. at Yonsei University, specializing in an undisclosed field. Following the completion of their Ph.D. in 2012, Koo ventured into entrepreneurship and became the CEO of loplat in 2014. Unfortunately, exact information about their role at loplat and its ongoing duration was not provided.

John (Jahyoung) Koo completed their education in a chronological order. John (Jahyoung) pursued a Ph.D. in Computer Science from Yonsei University, starting in 2007 and successfully completing it in 2012. Prior to that, they attained a degree in Electrical and Electronics Engineering, specifically an M.D., from Pusan National University between 1997 and 1999.