I'm not a stickler for the 'no ending in a preposition' rule, but you have to admit we tend to tack on preps for no reason. "Where are you at?" when "Where are you?" would work. But in the case of the aforementioned sentence, the 'at' was fighting with the 'of which', IMO. Just awkward to read. They could have even said 'something Jeff is a master at', and I wouldn't have had a problem.
Note that ends in a preposition, and is 'technically' incorrect, but I don't really care.
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