I was torn between three and four stars. The story isn't bad, but it's not fantastic.
And, there's enough writing problems, both on big picture editing and on style, to drop it to three.
First, the good/interesting. I had never heard of Dr. Robert White before, and did not know he was the man behind modern brain perfusion, which has made a lot of modern brain surgery possible. That probably includes cranially joined conjoined twins, not even mentioned here.
Some of the ethics issues are good, including White pushing for a (Catholic) theological based version of brain death, the eventual US legal standard of brain death and more.
Also interesting is the way White embraced the "Frankenstein" angle and even better, back to the ethics side, the way he willingly tangled with PETA and defended animal research surgery.
That said, it's uneven as a bio outside of this.
We get snippets of his wife. But, not a lot. What did she think of him, beyond the bits we're told, if available? We get tiny snippets of his kids, not enough to be worth inclusion.
Then, we get a conclusion chapter, which describes the way a semi-collaborator internationally from the "old days" and some of his students are working on spinal repair surgery, along with electrodes bypassing the spine. We're told bits of what White thought about the "cyborg" angle, but not a lot, and especially not if he, in hindsight, regretted his Frankenstein ideas, and/or regarded them as unnecessary. (Exactly what the Frankenstein is, is spoiler alert.)
Then there's the stylistic bits, jarring in part because Schillace is a former professor of literature.
The carotid arteries are described early on as the "great pulsing veins of the neck." Besides coming off as a bit purplish, that's a horrible word picture because the carotid arteries are ARTERIES!
Later, when White flies to Russia, we're told he's cruising over the ocean, which sounds like an ocean liner or cruise ship, but at "60,000 feet," which is not the normal cruising altitude for passenger jets, which is actually under 40,000 feet.
Later on, we're told about a bitterly cold start to a March day in Cleveland that eventually gets in the 50s. Given that the average temp in Cleveland for the full month of March is 47 degrees, anywhere in the 50s would be balmy.
To put it another way, Mary Roach, whose books are guaranteed to be moderately entertaining 3-stars, is among the blurbers. Enough said.