EnSys Energy has an established expert witness practice in the areas of petroleum refining economics, regulation and markets. The following are illustrative assignments:

Under the MDL 1358 series of cases relating to MTBE contamination of ground water, Martin Tallett has acted as expert witness first with Weitz & Luxenberg in the Suffolk County case and second with Sher Leff in the New York City case. Activities included extensive written testimony covering the refining/supply economics of MTBE versus ethanol in gasoline and the calculation of market share, as well as, for New York City, verbal on-the-stand testimony.

In State of New York versus the Oxygenated Fuels Association, EnSys led by Martin Tallett undertook detailed analysis for the New York Department of Environmental Protection of the OFA's claims regarding the refining and gasoline supply impacts of banning MTBE in New York State. Work included both written and verbal testimony.

In long running litigation before the Federal Energy Regulatory Commission between producers of crude oil in Alaska, EnSys and Martin Tallett undertook extensive analyses on behalf of ExxonMobil of refining economics on the US West and Gulf Coasts. These ranged from technical evaluations of specific refinery process economics to test methods, pricing mechanisms for petroleum fractions and extensive evaluation of product buy/sell contracts.

In 1998, when the Venezuelan national oil company PDVSA was proposing a joint venture with Amerada Hess relating to the latter's large St. Croix refinery, EnSys and Martin Tallett, along with leading oil markets expert Marshall Thomas, were retained by the Senate of the US Virgin Islands to evaluate the potential economic, environmental, jobs and related impacts of the joint venture. Company financial data, third party studies, EPA regulations and other factors were evaluated and presented in both written and verbal testimony.