Both Uses

Nietzsche
in
Change of Heart, by Picoult
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It was a copy of Raphael's Transfiguration, something I only knew because of an art history course I'd taken when I fancied myself in love with the TA who ran the class sessions—a tall, anemic guy with ski-slope cheekbones who wore black, smoked clove cigarettes, and wrote Nietzsche quotes on the back of his hand.†

Nietzsche = influential German philosopher remembered for his rejection of Christian values
—FRIEDRICH NIETZSCHE, THE CAY SCIENCE M I C HAEL When inmates tried to kill themselves, they'd use the vent.†
*

Friedrich Nietzsche = Friedrich Nietzsche -- influential German philosopher remembered for his rejection of Christian values

Definitions:

(1) (Nietzsche as in: Friedrich Nietzsche)
influential German philosopher remembered for his concept of the superman and for his rejection of Christian values; considered, along with Kierkegaard, to be a founder of existentialism (1844-1900)
(2) (meaning too rare to warrant focus)