Leader School is a private training and coaching company in Athens, Greece whose success, influence and expertise have made it one of the most prestigious training companies in Greece. It was established in 2003 by Simos Kosmetatos, Social Media & Internet Marketing Specialist with valuable expertise in Mass Media and Social Communication techniques and in building and managing Online Web Properties (websites, social profiles, online communities).The company is organized into 4 separate units — 3 training units (Social Media Marketing, Internet Marketing, Business Training) and 1 consulting unit.