Specialized in the removal of hijackers, spy- and adware and actively posting removal guides on several security-boards.
Is a list-editor for several of the lists most helpers use to analyze those HijackThis logs. Helps to train new spyware-fighters. Creates tools to help remove special variants of malware. Is a teacher moderator on several Security forums and Computer-Help forums.
His blog: http://www.pieter-arntz.info/wordpressblog/ and security related site http://metallica.geekstogo.com/ are often referred to as a useful guide. Works part-time as a blogger for Malwarebytes