I am writing a non-fiction book based on recorded interviews with several people. I have recorded verbal consent to be interviewed for the book from each person. One of the interviewees has since published his own book about the story he discussed with me. I have supplied written transcripts of the interviews to each person for review/clarification. I have not heard back from the one individual for almost a month and when I finally did make contact he was very abrupt, said he's been "very, very busy, and he was going to review it 'this week'." That was over a week ago and I have heard nothing.
Since I have recorded verbal permission and acknowledgement in his interview, can I legally move forward with his story as is or do I need to also have written permission? The other interviewees have signed a release and acknowledgment form, etc.
His story is a compelling one and would be a terrific inclusion for the book. I am confused about his reaction because when I told him I had completed the transcript he was eager to review it. He was very cooperative up to this point and at one time he asked if I would be interested in collaborating on his book. If he has changed his mind for whatever reason he has not indicated that to me verbally or in writing and his reaction is open to interpretation, which I prefer to avoid. A direct answer would be appreciated and I can move forward from there.
Thank you for any guidance you can provide.