David Berkowitz is the founder of the Serial Marketer consultancy and the 3,000-member Serial Marketers community. Prior roles include leading marketing and strategy for omnichannel ad tech platform Mediaocean, video production marketplace Storyhunter, social listening firm Sysomos, Publicis agency MRY, and Dentsu agency 360i. He has contributed more than 600 columns to outlets such as Advertising Age, MediaPost, VentureBeat, and Adweek, and he has spoken at more than 400 events globally.