Crossword puzzle clue "ancient doctor known for his work on anatomy"

Ancient doctor known for his work on anatomy

Opus ___ (Catholic teaching also called "the Work, work work work work")

Psychology pioneer known for his work in classical conditioning (and for his dogs): 2 wds.

Ancient Greek writer known for his fables

Pioneering biologist known for his work in genetics: 2 wds.

Psychology pioneer known for his work in child development: 2 wds.

Paleontologist known for his work in Kenya

Psychology pioneer known for his work in psychoanalysis: 2 wds.