Hoops, could you maybe shoot him an email for me, if I write it? I am NOT using my work email, and I can't get to my throwaways from here (or home, the fucking laptop died last night).
It has come to my attention that you have included me as a contributor to your newly-released book. I do not remember ever giving you permission to use my work, and I would certainly remember that. I am requiring you to remove any of my work from the book, and to remove any mention of me from the book. Simply put, I do not wish to be associated with you in any way.
Should you not comply, I will be directing a cease & desist letter to Amazon.com, and demanding that they not carry the book. I suggest you look up Amazon's policy on plagiarism or use of materials without the author's permission.
If I do not have a response within 5 business days, I will be sending the aforementioned letter. Make note that this will not be the only step taken, merely the first.
The Good Reverend Roger
(aka Roger Penrose)