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Our management

Our Executive team consists of leaders that are dedicated and committed to providing investors with energy investment opportunities that will have the potential to generate successful results. We have developed an impeccable reputation for our commitment to quality investment programs and provide the highest level of service to our investors.


Our Geoscience team

Our Geoscience team consists of highly-trained industry veterans who have more than 30 years average experience with the knowledge and extensive contacts to source, evaluate, acquire and operate projects to their greatest potential.

Our geological and engineering staff reviews prospects from a diverse number of geographical regions in the continental United States with a focus on the Bakken-three Forks area in North Dakota, the Permian Basin in Texas and New Mexico, and the Mid-Continent Region in Texas and Oklahoma. They evaluate all prospective acquisitions on the basis of their oil and natural gas producing potential, the predictability of their drilling and completion costs and their access to readily available pipeline hookups.

Michael J. Mauceli

Chief Executive Officer

Mike Mauceli is the founder and Chief Executive Officer of Reef Oil and Gas Companies. In his 26+ years as CEO, Mike has led the growth of the organization from a three full-time employee start-up company in 1987 to a much larger oil and gas production and property acquisition company today. Now serving the investment needs of thousands of oil and gas investors across the United States, Mike’s vision and business acumen has made him one of the most influential CEO’s in the oil and gas investor community. With Mike’s leadership and determination, Reef will continue to offer energy investment opportunities that will have the potential to generate successful results.

Dan Sibley

Chief Financial Officer and General Counsel

Dan Sibley, Reef’s Chief Financial Officer and General Counsel has more than 35 years of experience dealing with financial, tax and legal matters. Since joining Reef in 1998, Dan’s wealth of knowledge and experience has been utilized for investments and operations in oil and gas acquisition, and domestic and international energy development activities. Prior to 1998, Dan was involved in the private practice of law.