He went through every department, working hand in hand with the employees for over a year to understand every nook and cranny of the company he leads. Kind of like the “Undercover boss” but he was not really meaning to hide. He does not have a “regular day” and his phone is his best ally. But there is much more to the life of a high executive, and Mark, CEO of Entelmann Gruppe, shares all the details of his years in charge of the company.