Catherine Llewellyn is a Digital Marketing Content Strategist and the Founder of Vast Interactive, a boutique digital marketing consultancy and content studio. She specializes in helping professional services and health-oriented organizations build sustainable, data-backed marketing strategies that prioritize clear communication and client trust.

Throughout her 25-year career, Catherine has focused on ensuring digital tools serve as a benefit for real-world impact. Her experience includes managing large-scale digital initiatives for brands such as Water.com and contributing to content marketing projects at agencies including BBDO and Razorfish. Whether she is refining website messaging, managing complex eCommerce shopping carts, or creating relatable social media posts, her work is purpose-driven. By minimizing digital noise, she helps organizations build meaningful connections with the people they serve—transforming complex digital marketing into a clear, sustainable path for growth.

Catherine graduated from Duke University with a major in English and a minor in Psychology and founded Vast Interactive in 2007.