Sithen is the co-owner of CallMe translation services, which he started up with no capital. He is also General Representative of "Kon Khmer Koun Khmer," a film collective run by Cambodian young volunteers, and the President of "Mastermind Club." His current project is the "Cambodian Hero Web Site," documenting prominent historic and living Cambodian nationals. Sithen says, "All these involvements are the results or parts of what I call 'Self-Education,' which is a long-time, yet unused tool of learning and sharing things with Cambodian future leaders."

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