DR JohnG, I've read two books on Ravel, both of which I enjoyed. The first was the Orenstein bio, which was published by Dover. I read it in college when I knew next to nothing about Ravel. I wish I still had it; I'd love to read it again now that I know the compoer's music better.
The second was the Nichols book, which I've only bropwsed through since I purchased it in 2019. I don't know how I missed Benjamin Ivry's book when it was published, but after reading the Amazon reviews, I will look for a copy.