I can appreciate your desire to get the most of this persons potential. I can also appreciate that non stutterers will never understand what it is like and I also want to add that there are so many different levels of stuttering that many of “us” won’t ever fully appreciate just how difficult the stutter makes another person’s life. You want to help. You can’t single him out or offer reasonable accommodations or really even acknowledge his stutter unless he brings it up because it is a protected disability under the ADA. If you are not in a position that is above him then the conversation should come from a friend point of view and ideally not at work. And that assumes you guys are actually friends. I strongly suggest you treat him like everyone else and if become an ally if he talks to you about it or wait until you are actually friends and it’s appropriate to ask a somewhat inappropriate question, There is no easy answer. Again, i applaud your desire to want to help him but the bottom line is, there IS nothing to help him out with unless he thinks there is. Good luck, and stay compassionate. But recognize limitations and boundaries. Particularly the legal ones.