Commit's are showing the wrong person associated

I noticed that when you view commits it has the wrong person's name by my commits. On the main screen it shows me as making it but then it shows Zach Wiesman on the commits page. I know Zach and do work for him and he shares repositories with me but I'm confused as to why his name is showing as me doing the commits. He has never used my Mac or anything.

I already checked the .gitconfig file and I'm in there and not him. Any other ideas?

Thanks
Matt