Art Nudes

I'd like to put out a call to the collective brain of the various readers of this blog. My photographic mentor is looking for a publisher for a book of his fine art nude photographs and montages. His collected work spans an incredible 50 years, and is of the highest quality. While he has been featured in magazines and so forth, has never been published in book form. Now he has reached his senior years, he'd like to publish this 50 year retrospective. So, my question is this... does anyone out there know any good publishers who might be worth approaching? Canadian companies would be best, but anything North American would do. Please leave your suggestions in the comments section below. Thanks!