I have a stutter, had one ever since I could speak. Seeing how the speech therapist didn’t help, nor did it help me. I only have one thing I can recommend. Just that you and he need to come to terms with it being a persistent factor of his life. I found that by accepting it, you sort of get a newfound confidence in yourself which ironically made me significantly more fluent. Reading your comments with other people, it seems like he’s doing perfectly well. He’s adjusted to it and he seems confident enough that he’ll make it through. He sounds like he shouldn’t have any major problems. College is more open minded, so he’s not likely to meet much difficulty. If he has trouble finding social activity, there’s always clubs/societies/orgs for him to join that could cater to his interests. Schoolwork might have some problems, particularly with presentations but he just had to push through with it. He has to learn to find a way to do public speaking that works for him, so that he can manage himself better when he enters the workforce. I’ve found lasting college friendships, a fiancé and also been valuable at my own work despite this shortcoming. Sure I still struggle in large social gatherings as I am reserved, and yeah I have trouble networking but that’s due to inexperience. But like anyone else, these skills will come with time. Instead of worrying, you should find ways to encourage him and give him confidence. That will do a lot more in the long run then trying to fix a stutter.