The thing about cognitive biases is their pervasiveness. They can affect all areas of our thinking. But some have a bigger impact on management, leadership, and business decisions. And one example is the Halo Effect.
The halo effect can take a single example of excellence, and create the impression that we have a star in our midst. This could be company results, an effective middle manager, or a new hire.
With all of these, we have the ability to see something great and assume it is part of a pattern. The evidence for this may be lacking. Indeed, it may be a one-off hot-spot in a field of mediocrity.