Bussard was a human, a bureaucrat who worked for the Cephalic Security thought-police organization on the planet Rampart in the 24th century.
By 2366, Bussard was a trusted employee, middle-aged, double-chinned and baby-faced. Part of his job was to review recorded memories of Dissenters and manually purge the data of any elements of fiction, imagination or creativity. His equipment contained a variety of filters to protect him from becoming exposed to any such illicit thoughts. He used a portable mind-cleanser to rid himself of any accidental exposure. The resulting data containing filtered recordings of memories were saved to disk and could either be inspected later or implanted into convicted felons.
He also oversaw nurses who performed brainwashing on Dissenters, like Marjorie Smith and Amoret.
History 
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In 2366, Amoret had recently been implanted with the false memories of a brainwashing nurse. Bussard set a trap to test her. He left his office door open overnight, allowing easy access to the stored memories of Jean-Luc Picard that she’s extracted earlier that day. Picard’s disk had been prohibited and rated High Crime. Amoret sneaked into Bussard’s office and watched Picard’s unfiltered memories throughout the night. In the morning, Bussard returned to work and reported all of Amoret’s activities to Robert Hazlitt, mentioning that she hadn’t yet left the building and would have to be killed, since her false memories hadn’t taken. (TNG novel: Gulliver's Fugitives)
