Ziff Energy Group Ltd. is a consulting company providing sophisticated industry and operational business analysis, expert consulting and expert witness services to the North American and international energy industry. Based in Houston, Texas, it offers a range of exploration and production, natural gas and greenhouse gas services. The firm provides long term forecasts for the gas industry, benchmarking reports and oil and gas production consulting. Ziff Energy Group Ltd.'s list of clients includes Abraxas Petroleum Corporation, Accumedia Technology, Bantrel Inc., Channel Lake Petroleum Ltd., Columbia Gulf Transmission and MacDonald Engineering Group, to name a few. It partners with Accenture, Halliburton, NL Fisher, Schlumberger Inc. and Stantec.