You must encourage your employees to overcome their differences and promote an environment that fosters responsibility, dedication and transparency. It needs to make its presence known on a regular basis to enforce consistency in the workplace. Since speaking to the group both together and individually hasn't worked for Doug, I would suggest engaging his employees in ways designed to foster understanding and better mutual working relationships. Some of these activities might include encouraging quality teamwork by rewarding groups for good performance. Create incentives for teamwork by giving praise and small tokens of appreciation. Another way is to encourage group mentoring among colleagues. The nature of group mentoring will develop individual and interpersonal relationships between colleagues and hopefully increase engagement, giving them a greater understanding and awareness of their peers. However, if all else fails and his employees continue to behave as they do, in an impartial and professional manner, Doug must directly address his employees' toxic behavior and put clear expectations in place. He must inform his staff that they need to change their behaviors and work as a team or be asked to leave, reiterating that he will not tolerate the current way his organization is