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Our People

Cheryl Collarini - CESI Chairman  


Cheryl Collarini holds a BS in civil engineering from M.I.T. and an MBA from the University of New Orleans. She began her career as a civil engineer with Mobil Oil and advanced through positions as operations engineer, development projects engineer, and reservoir engineer, ending her 11-year career with Mobil as a reservoir engineering supervisor. In 1985, Cheryl resigned from Mobil to begin a consulting practice. Specializing in reserve appraisal for the purpose of transactions, borrowing, and investment decision-making, Collarini Engineering grew to its present size of about 20 employees with offices in Houston and New Orleans. In 1995, she founded Collarini Energy Staffing to provide technical staff to customers who need help managing their own projects. From its Houston head-quarters, Collarini Energy Staffing recruits and places EPC and oil and gas professionals, temporary and fulltime, in positions all over the world.

Volker Rathmann - CESI President  


Volker Rathmann holds the position of President of Collarini Energy Staffing Inc. to which he brings 30 years of business and industry expertise. His experience has been focused in leadership roles for internationally oriented and growth-potential companies. Volker joined Collarini in 2001 as Vice President of Business Development with the objective of bringing the companies to their next level of excellence. Through a series of market-ing, sales, and business development campaigns, he leads a continually growing E&P staffing business in addition to managing the marketing of the collected expertise of the Collarini companies. Prior to joining Collarini, Volker held the position of Chief Financial Officer for INTEC Engineering, a provider of specialized engineering services in global frontier and deep-water projects. Before INTEC Engineering, Volker held a number of leading positions in operations, marketing, and finance within the DaimlerChrysler Corporation. During his tenure with DaimlerChrysler, he gained the experience and background of managing globally-oriented and growing firms. Volker earned a Bachelor's degree in business administration in Berlin, Germany.


Vice President - Operations

Troy Jeffrey holds the position of Vice President of Operations. He joined Collarini Energy Staffing in 2014 and brings extensive staffing experience in technical and professional business segments in the upstream oil and gas industry. His background also includes assembling multi-disciplinary teams for a variety of major and independent in the upstream industry. Prior to joining Collarini, Troy distinguished himself in recruiting at two Houston based corporations, Seis-Strat Services and Subsurface Consultants & Associates. For the past ten years, he has built extensive and valuable knowledge and connections within the geological, geophysical, and petroleum engineering candidate community. Prior to the staffing industry, Troy spent 15 years in the business world where he held a combination of sales and business development roles within the mortgage lending industry. Troy holds a BS in management from the University of Phoenix.


Vice President - Administration

Vanessa Mills holds the position of Vice President of Administration and is a Staffing Specialist in the areas of reservoir engineering, geoscience, and technical support personnel. She joined Collarini Energy Staffing in 2005, beginning her career as our Receptionist and progressing over the last 12 years through numerous positions including Staffing Assistant, Staffing Coordinator, and Placement Specialist. Vanessa currently handles all back-office administration and placement support. Vanessa holds a bachelor's degree in business management. She is active in the SPE Petro-tech group, having served on several committees.


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