About Stelios Tzellos

Stelios Tzellos is a pharmaceutical strategy and oncology analytics professional with experience across academic research, life science consulting, and global pharmaceutical organisations. His career has been defined by the ability to connect scientific understanding with commercial and strategic outcomes.

He completed his undergraduate and master’s degrees in Biochemistry at Imperial College London, followed by a PhD in Molecular Biology. His doctoral research focused on gene regulation in Epstein–Barr virus, contributing to peer-reviewed scientific publications and conference presentations.

Following academia, Stelios transitioned into pharmaceutical analytics, working in oncology forecasting, disease insights, and commercial strategy roles. He has held positions at GlobalData and IQVIA, supporting market modelling, competitive analysis, and strategic planning across multiple oncology indications.

Stelios later joined AstraZeneca, where his work expanded into business insights, analytics leadership, and oncology marketing. Across these roles, he has supported product strategy, market planning, and launch readiness in complex, competitive environments.

His professional approach is grounded in clarity, alignment, and evidence-based thinking. He focuses on helping teams make better decisions by understanding not only the data itself, but the assumptions, risks, and trade-offs behind it.

Outside of work, Stelios lives in the UK with his family and maintains interests in sport, live music, and hands-on creative projects.