Professor hume has spent the last ten years studying the effects of people's levels of self-esteem on their tendency to discriminate against others. she is most likely to be a

social psychologists

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question she is most likely to be a social psychologists. This can be said because Professor Hume is studying effects of people's levels of self-esteem which is determined by the individual's societal environment.

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