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Nathan ClarkNathan G. Clark, SPE, was named senior vice president of perforating and technology at Geodynamics. He has more than 23 years of experience in the design and development of shaped charges, explosive devices, and completion tools used in the oil and gas industry. Clark has developed perforating systems for Western Atlas/Baker Atlas, Halliburton, and Geodynamics. He holds 21 US patents. He has completed special and classified projects for the United States Army, Air Force, Navy, Sandia National Laboratories, Los Alamos ­National Laboratory, and the United Kingdom Ministry of Defense.

Cameron KirkpatrickCameron Kirkpatrick, SPE, was appointed vice president of US sales at Geodynamics. He joined the company as a junior sales representative and held numerous sales positions at the territory, regional, and national levels before being named director of business development last year. In his new position, Kirkpatrick manages the company’s US sales and field operations organizations. He is also responsible for the overall sales strategy, including partnerships with operating and service companies.

Alan LinnAlan Linn, SPE, has been appointed chief executive officer (CEO) of Afren. Before joining the company, he was the CEO of Roc Oil from 2011 and also held the positions of acting CEO and chief operating officer. He has worked in management positions at Cairn Energy India and Tullow Oil and has more than 30 years of experience in the industry. Linn holds a BS in chemical and process engineering from the University of Strathclyde.

Dean RietzDean C. Rietz, SPE, has been named president of Ryder Scott. He joined the company in 1995 as a petroleum engineer, specializing in reservoir modeling, and later became the manager of the stimulation group. Rietz has 25 years of experience in the oil and gas industry and is a lecturer at the University of Houston’s Cullen College of Engineering. He holds a BS in petroleum engineering from the University of Oklahoma and an MS in petroleum engineering from the University of Houston.

Member Deaths

Albert F. Balasch, Calgary, Alberta, Canada
David F. Bergman, Katy, Texas, USA
Bob Diggs Brown, Dallas, Texas, USA
Edward B. Carney, Houston, Texas, USA
Frank S. Cordiner, Casper, Wyoming, USA
Alvis Lee Dowell, Lindale, Texas, USA
Charles N. Hefner Jr., Lafayette, Louisiana, USA
Eddie J. Hudson, Tulsa, Oklahoma, USA
Homero G. Gracia, Sugar Land, Texas, USA
James Calvin Kromer, Spring, Texas, USA
C. Wayne Nance, Bullard, Texas, USA
Harold L. Siegele, Houston, Texas, USA
Kenneth Bernell Wisdom Sr., Metairie, Louisiana, USA