BIG THUMB was founded by Stephen and David, who specialise in automotive and engineering content production. We pride ourselves on a story well told and we are committed to being excellent creative and business collaborators.
We share enormous enthusiasm for our work and strive to create groundbreaking and never-before-seen premium content. Our focus is on factual entertainment and observation documentaries with global appeal, and we want to tell fresh, exciting and high-energy stories that are compelling and unforgettable.
Stephen Mizelas
Founder
Stephen has an impeccable 25-year track record of delivering successful television series and films primarily focussing on the automotive and engineering sectors, and worked with many broadcasters, including the BBC, Channel 4, ITV, Sky, Discovery, National Geographic, Amazon and Netflix.
Stephen has a reputation for making ambitious, intelligent and entertaining formats, including cult series Chop Shop, Wheeler Dealers and countless automotive access docs. Other shows conceived, pitched, developed and made include Back to the Falklands, Speed Dreams:The Fastest Place on Earth, How to Build a Satellite all for the BBC and a brand new true crime for Amazon.
Stephen has also produced and developed the Channel 4 series Battle of Britain: Model Squadron, the BBC’s Bang Goes the Theory and has an extensive black book of contacts with reputable blue chip brands.
David Sitton
Founder
David is a super-consumer of automotive and engineering content and is in tune and up-to-date with the latest trends and cultures within these sectors. He is also a qualified engineer and over the past couple of decades has built and restored more than 100 cars.
Most recently David has helped produce Wheeler Dealers and Wheeler Dealers Dream Car for Discovery since the show returned to the UK, and before that was a consultant helping large engineering, technology and automotive companies with product development and innovation.
David also spent more than 10 years working in print and broadcast news and media
Mark Harrison
Business Development
Automotive Specialist
Mark has worked in the global car industry for nearly 30 years within volume, premium and luxury car and motorcycle brands. He first worked with Stephen in 2010 when, as McLaren's PR Director, he helped produce the ground-breaking How To Build a Supercar BBC documentary. More recently, he collaborated with Stephen on the BBC's award-winning 2023 Born To Race documentaries about two aspiring young, black racing drivers looking to emulate their hero, Lewis Hamilton.
Whilst at McLaren, Mark also worked with Lewis in the UK and the Middle East on launch content for the company's first production road car, the 12C, and, more recently, celebrated winning the 2022 Autocar Award for Best Use of Social Media for Praga Cars. Prior to his time at McLaren, he managed BMW UK's PR for nearly 10 years and was responsible for the Ewan MacGregor Long Way Round series that resulted in the GS then becoming the best-selling motorbike in Britain. Content that delivers brand-building and sales lies at the heart of his creative thinking and networking. Mark's PR teams have won PR Week and CIPR awards and he is currently Executive Director and Founder of the Motor Industry Communicators Association.