Dan Zarrella is the award-winning social media scientist at HubSpot and author of three books: "Zarrella's Hierarchy of Contagiousness," "The Social Media Marketing Book" and "The Facebook Marketing Book".

He has a background in web development and combines his programming capabilities with a passion for social marketing to study social media behavior from a data-backed position and teach marketers scientifically grounded best practices.

Webinars in his "Science of..." series have drawn upwards of 30,000 registrants.

And he holds the Guinness World Record for the largest webinar ever.

^[0]