Tessa LeGassick

A MIPA-accredited media planner with nearly 20 years of experience, Tessa LeGassick is dedicated to elevating the craft and impact of strategic media planning. Since joining Hearts & Science UK at its launch in 2017, she has pioneered Connections Planning as a core discipline and played a pivotal role in the agency's rapid growth, helping drive a 200% increase in billings between 2021 and 2024. Appointed Chief Planning Officer in 2025, Tessa leads the development of Hearts' proprietary planning processes and frameworks, including the award-winning Category Entry Points tool and the Velocity planning model. Her commitment to innovation and effectiveness has earned widespread industry recognition, including being named Media Planning Leader of the Year by Campaign. Passionate about blending creativity, data, and inclusivity, Tessa continues to push boundaries in attention-led and privacy-first planning, ensuring Hearts remains at the forefront of planning excellence.