What it is
The halo effect is a bias where a good impression in one area shapes how we judge a person, company or product in other areas. Edward Thorndike named it in 1920, in “A Constant Error in Psychological Ratings”: officers rating soldiers on looks, intellect, leadership and character gave scores that all ran together.
It works in reverse too. One bad trait can make everything else about someone look worse.
How it shows up for me
I’m most vulnerable to it with people who are articulate. Someone who speaks well gets a lot of credit from me for things speaking well has nothing to do with. I try to separate the voice from the record.