Two aspects of reputation that need to be considered here are breadth and depth. If you're looking for a reputation that covers a lot of ground, you need to look for those types of exposure. Getting published in high visibility forums or publications is the key to that. The number of exposures determines how many of the readers of those forums will remember you. The quality and usefulness of the information determines how well they remember you.
Depth is another matter entirely.
It has to do with relationships. That's where individualised responses come into play. If someone emails you regarding a post or other public comment, your reply has an enormous effect on your reputation with that person, and their conduct toward you publicly. The first part is most important from the human standpoint. The second part is what affects reputation most strongly.