There is one outstanding hacker in our company. He is one of the smartest people I've met. He knows so much and incredibly deep. However, he has no blog. He has

There is one outstanding hacker in our company. He is one of the smartest people I've met. He knows so much and incredibly deep. However, he has no blog. He has no github account. He does not share own code anywhere. He does not use social networks. Your advices quite correct, but quite dangerous at the same time. I learned that CV are often misleading, so better to contact a person and ask some questions...