Purposeful businesses make money from solving problems and never from creating them. They identify a challenge and focus their efforts on doing something to help customers overcome it. They work to minimise any negative impact those efforts may have on wider society and the planet.
A thought leader certainly needs to have wide experience of their subject matter, and they also need to think deeply about it. Through practice, research and discussion, they strive to acquire meaningful insight. The final piece in the jigsaw is the desire to share that insight with others.