I worked for 40 years at a company that made most of NASA's rocket engines, and a host of other impressive technology. There were many, many geniuses there - lots of literal rocket scientists, and leaders in fields like materials science and chemical engineering. One thing I learned early on was that most of the true geniuses looked down on people who mentioned being members of Mensa. It was like a red flag that the person cares too much about being perceived as smart. People who care so much about that put more energy into fostering the image than actually contributing.