Professionalism. Whatever you might imagine under this term depending on your field of expertise, we can probably all agree that someone who lacks a professional attitude and manner can never become a manager or successful leader. Professionalism means being trustworthy, an expert in a given field, keeping your word and being able to influence others in a positive way. And in order to be a successful leader, you must also possess a certain charisma. This article offers five practical pieces of advice on how to appear charismatic and professional at work as well as in your personal life.