My former T would on occasion mention another client (not by name or any identifiable information) but by saying something like, "I had another client struggle with this and they found x,y,z helpful. Is that something you'd be willing to try?" Etc. It didn't really bother me one way or the other. It's not like I knew the person. It's also not like the other person would know me if she spoke about me in their session. Shrug. Kit