I would do periodic organization culture assessments by an outside and professional firm. Things like, who is respected, who is hated, who is consider incapable

I would do periodic organization culture assessments by an outside and professional firm. Things like, who is respected, who is hated, who is consider incapable, who people enjoy working with. etc. As a consultant I worked for several large IT organizations, and I got to see a lot of very toxic people. Some were really high up, some middle managers. They were assholes with everybody but I bet they were very nice to their own bosses, and worked very hard at masking their incompetence. Those people can really screw the organizational culture.