David’s stories are fascinating, and he does something quite remarkable with his tone. Here the obvious comparison is to the neurologist and prolific writer Oliver Sacks, often described as the poet laureate of medicine. Even when Sacks wrote about tragedy, his narratives were imbued with meaning, and if not positivity, then at least a sad beauty. David appears not to be driven by the same impulses. Even when his case studies have positive endings, a rather thick vein of gray runs through them.