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  • Stewart Nicholson


    Stewart Nicholson

    Stewart Nicholson is president and founder of Primex Process Specialists, Inc. Stewart received his Batchelor of Applied Science degree in Mechanical Engineering in 1984. Since then he has been developing and applying techniques to evaluate and optimize flue gas treatment systems used in power generating applications. Stewart is an ASME published author, Professional Engineer and former President of the Dry Scrubber Users Association.

  • Rodrigo Camargos

    Engineering Manager

    Rodrigo Camargos

    Rodrigo joined Primex in 2014 with extensive power industry experience in engineering and maintenance management. Rodrigo received a Bachelor and Master of Science degrees in Chemical Engineering from the Universidade Federal de Minas Gerais (Brazil) in 2003.

  • Valerie Kirk

    Lab Services Manager

    Valerie Kirk

    Valerie Kirk is a seasoned professional with over 20 years experience in project coordination and facilities operations across multiple industries. Dedicated to being a collaborative team member, Valerie brings her skilled attention to detail and project management abilities to her Lab Services Management work at Primex. Valerie attended Montgomery County Community College and has an Office Assistant Certification.

  • Richard J. Defieux


    Richard J. Defieux

    Rick joined Primex as an investor and director in 2003. He is an experienced venture capital investor with a history of pioneering new investment segments and strategies in cleantech, clean energy, communications, software, IT, impact investing and direct secondary transactions. Rick earned his MA at Boston University in 1976 and an MBA from Columbia University in 1984.

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