CURT NICKISCH: We should define bad because I think when we say bad bosses or bad leaders, we immediately think we know what we’re talking about. So very simply, along that axis, a leader is a good leader if he or she is effective and a leader is a bad leader if he or she is ineffective. CURT NICKISCH: That’s Barbara Kellerman, fellow at the Center for Public Leadership at Harvard’s Kennedy School of Government and author of the new book, Leadership From Bad to Worse: What Happens When Bad Festers.