David Llewellyn is the head of development for the PLEXOS product, with a deep understanding of the technical and mathematical underpinnings of the engine. He has been working for Energy Exemplar (previously Drayton Analytics) since 2003.

Prior to joining Energy Exemplar, David worked as a software engineer developing real-time monitoring, scheduling and optimisation software for Sony. He also has experience developing software for the manufacturing, financial and entertainment sectors.

David earned his Bachelor of Science degree (Hons) in information technology from the University of Glamorgan, UK.