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Senior Staff

John B. Cornwell
Risk and Consequence Analysis
CANARY Software Support and Development
Vapor Dispersion Research

David W. Johnson,  Ph.D.
Process Hazard Analysis (PHA)
Field Testing
Aerosol Research


Jeff D. Marx
Risk and Consequence Analysis
CANARY Software Support and Development
Fire Radiation Research
LNG Code Compliance


Timothy A. Melton,  Ph.D., P.E.
CANARY Software Support and Development
Vapor Cloud Explosion Research


William (Bill) F. Terrell
Process Hazard Analysis (PHA)
Process Safety Management (PSM)
Chemical Database Research

  Staff Bios



  Learn more by clicking on senior staff names.

  John B. Cornwell
John has over 30 years of experience in the fields of consequence and risk analysis. During the past 20 years with Quest Consultants Inc, John has directed the development and use of consequence and risk analysis software for modeling the impacts associated with toxic and flammable fluid releases. These software tools have been used in over 500 consequence analysis studies and 100 full Quantitative Risk Analysis (QRA) studies worldwide. Prior to joining Quest, John worked for the University of Texas Center for Energy Studies, Energy Analysts, Inc. and Los Alamos National Laboratory. John received his Bachelors in Chemical Engineering and Masters in Mechanical Engineering from the University of Texas at Austin.
  David W. Johnson
David received his Bachelors in Chemical Engineering at the University of Texas at Austin and a Ph.D in Chemical Engineering at the University of Oklahoma.

David is experienced in consequence and risk analysis and PHA. He developed models for releases from pressurized containment and the subsequent aerosol formation, pool spreading, heat transfer, and vaporization. He has directed research and testing to quantify aerosol formation in pressurized liquid releases. He has directed large scale outdoor testing to determine the effects of additives on suppressing aerosol formation during releases of superheated hydrogen fluoride.

David has acted as facilitator on numerous Process Hazard Analysis (PHA) studies including Hazard and Operability Studies (HAZOP), What If? studies, Safety Interlock Reviews (SIR), Failure Modes and Effects Analysis (FMEA), and Bow Tie studies.
  Jeffrey D. Marx
Jeff received a Bachelors in Mechanical Engineering at the University of Oklahoma, and a Masters in Mechanical Engineering at the Georgia Institute of Technology.

Jeff is one of Quest’s experts in consequence and risk analysis. His experience includes building siting studies, Quantitative Risk Analysis, and Process Hazard Analysis for the refining, LNG, LPG, chemical, and pipeline industries. Jeff is also responsible for several portions of the CANARY by Quest Consequence Modeling package.
  Timothy A. Melton
Tim received his Bachelors in Chemical Engineering at the University of Oklahoma. He continued his education at the University of Oklahoma, finishing both his Master's and Doctoral degrees while working part time for Quest Consultants Inc.

Tim is a computer modeling expert who directs and develops the models used by Quest in the areas of consequence and risk analysis. He has been involved in the continual development and upgrading of the CANARY by Quest Consequence Modeling package. Tim's most recent work has been in applying the techniques of Computational Fluid Dynamics (CFD) to problems relating to safety in the chemical and petrochemical industry.

Tim is also a Registered Professional Engineer in the State of Oklahoma.

  William (Bill) F. Terrell
Bill received a Bachelors Degree and a Masters Degree in Chemistry from the University of Oklahoma and a Masters in Chemical Engineering also from the University of Oklahoma.

Bill is an expert in Process Hazard Analysis (PHA) and Process Safety Management (PSM). During his engineering career he has facilitated Hazard and Operability studies (HAZOP), Safety Integrity Level (SIL) and Layer of Protection Analysis (LOPA) studies, as well as Hazard Identification (HAZID) studies for various companies worldwide. Hazard and Operability Studies (HAZOP), What If? studies, Safety Interlock Reviews (SIR), Failure Modes and Effects Analysis (FMEA), and Bow Tie studies

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