About Us
History
APESS was founded in 2005 to be an independent supplier of process simulation services. The best solution should not depend on the limitations of any specific technology. We provide specialist services to operating companies in the process industry sectors, engineering design companies and contractors, engineering consultancies and simulation software vendors. We will work for you, not for the software supplier.
Testimonials
“APESS brought the expertise we needed to make good on our plans to commission the plant control system before start up. Martin not only delivered the technical skills we needed but fitted seamlessly into our team.”
Andrew Taylor, Technical Manager, Urenco
“We approached others and were told the job was impossible or would take 6-12 months. APESS quoted 4-6 weeks and delivered.”
Ugur Akuen, Technical Manager, LyondellBassell
Pioneering Simulation in Process Industries
APESS is a leader in providing dynamic simulation solutions tailored to the unique challenges of the process industries. We are excited by innovation, but committed to the engineering problem. We'll choose the right tools, the right type of simulation and the right level of complexity to meet your needs. We'll also go where no one has gone before, if that is the best solution for you.

Principal Engineer
Our founder and principal engineer is Dr Martin Sneesby, a chemical engineer with operating experience on real plants and a PhD in dynamic simulation. Martin has been using process simulation software to solve real-world engineering challenges for more than 30 years. He has worked across the globe and across the market sectors, but always with a depth and process understanding that good simulation work demands.