Since gaining his doctorate at Birmingham University in hydrogen storage in metals, Stephen worked for over 20 years at the ISIS neutron source at the Rutherford Appleton Laboratory. He ran a group providing a scientific service to academics and industry and ran projects to build large scale neutron instrumentation.
In 2006 he became a visiting professor at the London Centre for Nanotechnology at University College London. In 2010 he filed a patent on a method to make nanostructured hydride/polymer nanocomposites and co-founded a spin out company Cella Energy Ltd.
The company has now gone through three rounds of funding and has 20 employees, spread across two sites: one at the Harwell Innovation Campus in Oxford and the other at the Kennedy Space Center in Florida. In 2011 Cella Energy won the National Shell Springboard award for low-carbon businesses.
Stephen started as the CSO but became the CEO in May 2013. In June 2014 the company changed owners and Stephen became the MD. The company has now scaled up the production of the material and is developing hydrogen based power supplies as products. It has a number of collaborations across the aerospace and automotive sectors, including one with the French aerospace company Safran and the world’s largest exporter of small electric Unmanned Aerial System, Israeli Aerospace Industries.