Dan Zarrella is an analytical marketing leader and data storyteller with over two decades of experience turning complex datasets into actionable insights. Known for his pioneering work as HubSpot’s Principal Social Media Scientist—where he helped drive growth from startup to IPO—Dan blends a deep understanding of consumer behavior with a passion for research-driven marketing. He is the author of four marketing books, including The Science of Marketing and Zarrella’s Hierarchy of Contagiousness, and holds the Guinness World Record for the largest webinar audience. Today, Dan leads data content initiatives at People Data Labs, where he explores how data influences human connection and decision-making. His work has been featured in The New York Times, Wired, Forbes, and AdAge, and he’s spoken at SXSW, DreamWorks, and beyond.
