AdSenseAdvisor has been part of WebmasterWorld since 2003. Google has likely replaced the individual who replies to posts under that account a few times since the account was created. And Google has done so again.

A WebmasterWorld thread announces a new AdSenseAdvisor who has joined the forums to help publishers with questions and concerns. This Googler is nameless at this point, but said:

The official search engine representatives at WebmasterWorld has recently been lacking. We see very few posts from Matt Cutts, GoogleGuy, AdWordsAdvisor and AdSenseAdvisor. I hope this announcement leads to more posts not just from AdSenseAdvisor but from other Google and Bing representatives in this non-search engine backed forum.

Forum discussion at WebmasterWorld.