The key focus of this work is on developing manager’s personality. The author, using scientific methods, came to a proposal of an ideal career course of such personalities since their first training for managerial posts to the time when they are able to educate their successors, and therefore, enhance their careers to a higher level. There were used two methods of collecting data – observation and qualitative interviews. The observation took over seven years. Based on evaluation of data, the author reached an embedded theory which he then verified by qualitative interviews with people working in the field. The theory developed by the author was adjusted and divided into two parts based on the processed data from the qualitative research. There emerged two parts of the resulting theory when the dividing aspect was the necessity to arrange some phenomena in terms of time while others pervade through the whole growth period of the manager’s personality. In conclusion of his work, the author had his newly emerged theory evaluated by managers in field to get feedback on its merit. According to the results of the feedback, a compliance with the theory defined by the author can reduce the time needed for educating a manager by half.