Sentence:  Descriptions of him vary from "aggressively intelligent," "inventive," "articulate," "the most ‘<WSD>op-ed</WSD>' academic in the field of education" to "arrogant" "combative," "hostile," and "dismissive" of ideas not his own. 
Meaning of the word marked with <WSD> tags:  Of a person, regularly expressing viewpoints by means of op-eds.