After qualifying with a degree in BEng (Hons) Yacht and Powercraft Design, Jonathan worked for the Defence Evaluation Research Agency (DERA) and later QinetiQ at Haslar. In this role he worked with both experimental and computational fluid hydrodynamics ranging from CFD application and validation and consultancy to scale model and towing tank testing. He did this on a wide range of vessels from IACC 72 yachts to submarines and large civil and military vessels.
Following this Jonathan joined Warsash Maritime Academy, teaching naval architecture and ship stability on both the navigation and engineering programmes to both cadets and senior officers in the Merchant Navy. In this role Jonathan also provided consultancy services covering education, training and assessment for the industry. During this time Jonathan became the principal lecturer (operations), with responsibility for management of the cadets and student support. He was also responsible for academic liaison with sponsoring organisations and shipping companies.
In 2014, Jonathan co-authored 'Reeds Volume13 Ship Stability, Powering and Resistance', part of the renowned Reeds Marine Engineering and Technology Series.