I didn't know the late Will Powers personally, only as a gifted and informed contributor to this forum, particulary in the field of book typography. But I guess that everyone here - people who knew him personally and anyone else - should be interested in the book set by his wife, "Type Works: Will Powers"; I have found the reference to it in John D. Berry's blog:

http://johndberry.com/blog/2011/07/27/type-works-will-powers/