There are many reasons why I decided to study Ph.D in Criminology and Criminal Justice. First of all, from my work experience, I believe that the roles of my job as a police officer are not only about investigation, arrest of criminals, or crime prevention, but they should also include the study on the causes of crimes, motivations behind unlawful acts and the development of criminal behaviors. Further, I think it is important to learn Thailand’s criminal justice system in terms of its obstacles and difficulties. By understanding all of these, it is hoped that crimes in our society can be solved more sustainably and efficiently. More importantly, when I made a decision to further my Ph.D, I knew that I must choose to study at Chulalongkorn University, the number one and most renowned university in Thailand.