Looks like Valve’s VP of Marketing Doug Lombardi has quit. This was told by a Twitter user under the nickname @wickedplayer494, who studied the Lombardi page on LinkedIn.
Doug Lombardi left the company in February, thus serving 22 years. In addition to marketing, he was also in charge of the press. Now his place is taken by Kaci Aitchison, who previously covered The International Dota 2 tournaments.