Digiday: Kevin Gentzel is out as head of sales at Yahoo, just six months into his tenure. Gentzel was a seasoned print ad sales veteran when Yahoo poached him in October, having had stints as chief revenue officer at the Washington Post and Forbes before that. Gentzel was at the forefront of the industry’s native advertising trend, having introduced editorial look-alike ad products at Forbes and later at the Post. He had good relationships with ad agencies, and he came to Yahoo at a time when the digital publisher was trying to improve its reputation with the ad community.