Founded in 1937, Ryder Scott Petroleum Consultants evaluates oil and gas properties and independently certifies petroleum reserve quantities. The firm performs several hundred consulting studies per year for a variety of clients, including those preparing annual petroleum reserve certifications for filers with the United States Securities and Exchange Commission, as well as clients listed on the London, Ontario, Toronto, Hong Kong and Australian stock exchanges. With more than 60 professional petroleum engineers and geoscientists, the firm conducts reserves evaluations, geoscience and geology studies, field development and enhanced oil recovery design, reservoir simulation, economic analysis, management consulting and expert witness testimony. It also provides a complete range of professional engineering, geoscientific and economic evaluation services. The Houston-based firm has branch offices in Calgary and Denver.