In his first interview after assuming the role of co-CEO with Ted Leonsis, Groupon co-founder Eric Lefkosky is tough on outgoing CEO Andrew Mason. “In Andrew’s letter to the employees when he notified people that he was leaving, he accepted responsibility,” Lefkosky tells Elizabeth Spiers for Fast Company . “You could say, ‘Well everyone was here and everyone’s to blame including the senior manager, the board, whatever.’ But at the end of the day, the CEO is the CEO. And he makes those tough calls. If they go well, you’re a hero, and if they don’t go well, you’re accountable.” He adds that “in the first 12 to 15 months of us being public we did not do a very good job of controlling the process,” but insists that he had been..