Please read this before you contact me:
Many people email me to ask questions about my work, to tell me what they think of my ideas, or to ask for assistance with school and university assignments. I read all the messages I receive, but the number of emails I now receive is so great that I have had to give up trying to reply to more than a few of them. In particular, I will not reply to students with queries arising from exam questions, papers or other assignments (except for students from Princeton University and the University of Melbourne). I also have to leave many good questions about my work unanswered. So if you do email me and don’t get an answer, please accept my apology – there just aren’t enough hours in the day.
Perhaps my replies to FAQ will help you with your query.