Someone you meet, whom, after a few minutes of interacting with, you realize, "This person is much more intelligent than I am. Any indicator of intelligence would say that this person has more brains than me. And you know what? That's fine by me. I am just happy to be in their presence. I am made more intelligent merely from my association with them."

Someone who has enough wit to go around, and doesn't have to worry about looking dumb around anyone else.