 As a consultant @-@ trainer to the Singapore Police Force since 1995 , Khoo has taught many police officers in Singapore how to use Sun Tzu 's principles of " <unk> " to be effective leaders and team builders . In 1997 , he was sent for intensive training and thereafter appointed as honorary Assistant Superintendent of Police ( <unk> ) in recognition for his contribution to the police force of Singapore . On 1 July 2009 , Khoo was promoted to the <unk> rank of Deputy Superintendent of Police for his long years of service to the police force . Khoo was listed as one of the top 50 great minds and thinkers by Great <unk> , an American think @-@ tank , for being " one of the outstanding figures in their own fields of <unk> , who have taught and enlightened the minds of other fellow human beings all over the world . " 
