When you config git you set your email and name. You can change the config per git repo, so first thing first make sure all the repo you want with your alias ar

When you config git you set your email and name. You can change the config per git repo, so first thing first make sure all the repo you want with your alias are set up correctly. This way you don't leak your info via commit. As for Github I think the easiest way would be to use two browsers? Or two profiles if you use Chrome.