John has led more than 30 investigations related to gas releases and explosions around the world and has acted as an expert witness in high-profile cases, including several at the Old Bailey in London.

A specialist in technical safety, John Evans has more than 25 years of experience providing risk engineering services to the oil and gas and transportation industries. He assists clients in the identification, analysis, management and investigation of large-scale hazards, such as fires and explosions, and provides operational support for both onshore and offshore facilities. John joined Thornton Tomasetti in 2018 through the firm’s acquisition of MMI Engineering, for which he served as managing director.

Diverse Skill Set
With a background in process safety operations, John has a deep understanding of the hazards caused by the release of hydrocarbons and practical approaches for mitigating and managing them. Using a variety of tools and techniques, he provides safety assessments for both new and existing assets across the lifespan of a project. His work includes feasibility studies, concept selection, cost benefit analysis, performance standards and day-to-day support of ongoing operations. He provides technical support in such areas as regulatory compliance, major accident hazard assessment, independent workforce consultation, incident support services and evacuation, escape and rescue assessments.

Professional Contributions
John continues to explore the hazards associated with the release of hydrocarbons, including those found in natural gas and crude oil. He was a member of the International Organization for Standardization technical committee that developed a standard for jet fire testing, and is currently director of PFPNet, which is dedicated to raising passive fire protection standards in hydrocarbon-based industries. John has authored several technical papers and articles. He is also a frequent presenter at international conferences and guest lecturer at academic institutions, including the University of Leeds.

Outside of Work
A fitness enthusiast, John enjoys running and cycling. He regularly participates in races, mostly for enjoyment. He also enjoys exploring the science of athletics in articles for Physics World magazine.

• Hazard identification and assessment
• Fire protection system assessment and design
• Fire and explosion risk management
• Operational management
• Expert witness
• Regulatory compliance
• Process safety management