To minimize the burden on someone you really want to participate you could conduct an audio interview with him and then post the transcript and link to the audio.

College professors who have just published a book will be especially open to writing a post that will generate publicity for their book. Tell them the post will go live on the day that Amazon starts selling their book and you will urge readers who like the book to write an honest review of it for Amazon. LW could develop a reputation as a place where if you participate and write a high quality book, lots of people will write online reviews of the book.