The study aims to examine the influence of transformational leadership, personality and job satisfaction on teachers' organizational citizenship behavior (OCB). The variables of transformational leadership, personality and job satisfaction were treated as independent variables while the dependent variable is teachers' organizational citizenship behavior (OCB). The study was conducted on proportionally selected 198 lecturers of public senior high schools in the city of Bekasi, West Java, Indonesia. Using mix method, sequential explanatory design is applied where quantitative come first. The study both quantitatively and qualitatively reveals that there is a positive significant relationship among variables under the following distribution of coefficient of correlation: transformational leadership to teachers' organizational citizenship behavior = 0.777, personality to teachers' organizational citizenship behavior = 0.916, job satisfaction to teachers' organizational citizenship behavior = 0.852 and when tested together it produces coefficient of correlation = 0.921 and coefficient of determination = 0.847 indicating the existence of other 15.3% variables not including in the model affecting organizational citizenship behavior in public senior high schools' working environment.