Last year during SMX East, Barry Schwartz spoke with Fili Wiese about several topics, including managing Google penalties, how Google penalizes web sites, as well as a bit on the disavow link tool and nofollow link attribute.
Fili Wiese worked at Google for several years, where he worked with the Google search quality team manually penalizing sites. He even spent time working with the team that issued manual actions on websites that violated the Google webmaster guidelines. He eventually left Google and began his own SEO consulting firm. The name of the company is SearchBrothers since he works with another former Google search quality analysts, Kaspar Szymanski.