Data scientists are professionals in data science, and I was once hired as a senior data scientist in a company, but I thought the title of that job might be misnamed.
What is the etymology of "data scientist"?
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Wikipedia has an etymology section in their Data Science article.
Reading it over, there does seem to be a little controversy over the name of this field! There's no doubt, though, that people working in data science employ scientific principles.
As far as your job though, individuals and companies often have incentive to make their positions sound fancier than they actually are.
Nonetheless, Data Scientists at Princeton are probably doing very different things from the Data Scientist I at your local health department.