He holds a Royal Society Industry Fellowship (2024-2028) working with the fine chemicals company Givaudan SA on new approaches to solvent minimisation.

He was the first person to use comprehensive gas chromatography (GCxGC) to establish the complexity of volatile organic compounds found in urban air, completed whilst on a research sabbatical at RMIT University, Australia.

[12] With Prof. Chris Whitty and Dr Deborah Jenkins he published a future research needs strategy on Indoor Air Quality.

[13] He has collaborated with Peter Edwards at York to evaluate low cost air pollution sensor technologies[14] and with David Carslaw on diesel engine NOx emissions.

Lewis was awarded the Desty Memorial Prize in separation science at the Royal Institution in 2001, a Philip Leverhulme Prize in 'Earth Ocean and Atmospheric Sciences' in 2004, the SAC Silver Medal in 2007 from the Royal Society of Chemistry, and the John Jeyes Award for Environment, Energy and Sustainability in 2012.