It must encourage its employees to overcome their differences and promote an environment that promotes responsibility, dedication and transparency. He must make his presence known on a regular basis to reinforce coherence in the workplace. Since speaking to the group, together and individually, has not worked for Doug, I would suggest that he engage his employees in a way that fosters understanding and better working relationships with each other. Some of these activities could include encouraging quality teamwork by rewarding groups for good performance. Create incentives to work well as a team 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 better understanding and awareness of their peers. However, if all else fails and his employees continue to behave the way they do, in an unbiased and professional manner, Doug needs to directly address his employees' toxic behavior and put clear expectations in place. He must inform his colleagues that they must either change their behaviors and work as a team or be asked to leave, reiterating that he will not tolerate the way his organization currently operates.