David Berkowitz is the chief strategy officer of Sysomos, the global leader in social marketing and analytics. His previous roles include serving as chief marketing officer at Publicis Groupe agency MRY and vice president of emerging media at Dentsu agency 360i. Mr. Berkowitz has contributed more than 500 columns to outlets such as Advertising Age, MediaPost, and VentureBeat, and he has penned his Serial Marketer blog since 2005. He has spoken at more than 300 events globally.