I want to say that Roger Waters is doing the schoolmaster bit on the LP, but I'm not sure. The girl in 'One of my Turns' was some random girl that Waters and Bob Ezrin found in LA, and they asked her to speak the part (which she obviously accepted). I haven't seen her name anywhere.

A little known fact is that Waters was going to do that part in 'One of my Turns', but (thankfully) chose to get a real girl to do it.