North America Subsidiaries


Our operations in North America span the United States and Canada with multiple subsidiaries to form a network that brings together highly specialised technical services for the safe and efficient delivery of our clients' projects.


CH·IV International is a global engineering and consulting firm that provides full spectrum solutions to asset developers, regulators, owners, operators and lenders across the energy, infrastructure and resources industries. Our team of expert advisors work in close partnership with our clients to ensure that their assets are developed, designed, constructed and operated safely, in accordance with the project’s technical and commercial specifications while adhering to regulatory and environmental requirements.

CH·IV has served the LNG Market for over 20 years, with projects across the entire LNG value chain including LNG import, export and Bunkering facilities. CH·IV is the independent engineering and consulting arm of Clough, providing fully integrated, end-to-end solutions.  With over 150 years of combined engineering experience, CH·IV takes pride in maintaining the highest standards of technical accuracy, proficiency and integrity, setting new safety and performance benchmarks every single day. Established in 2001,  CH·IV  is a wholly owned company of Clough.


Headquartered in Philadelphia, Pennsylvania, JJ White is the largest and most comprehensive construction company in the Mid-Atlantic, Midwest and New England regions.  

Today, JJ White supports Power, Chemical, Paper, Refining, and Steel construction and renovation.  Since its founding as a mechanical contractor in 1920, JJ White has evolved into a single-source, multi-trade contractor with experience in a wide range of disciplines.  JJ White was established in 1920 and is a wholly owned company of Clough.


From engineering to operations, e2o Workforce Solutions is one of the premier suppliers of professional, technical, and skilled craft personnel with proven skills and experience to clients across multiple industry sectors.  Whether it is in support of the office, projects, maintenance, or operating facilities, the e2o team has a long history of providing qualified personnel nationwide and will match the best talent with your specific needs.

e2o’s services and capability address every phase of industry endeavor from planning and design, engineering, construction, procurement and operations & maintenance. We supply at all levels of personnel from clerical to senior management and apprentice to skilled trades.

In addition to personnel, e2o Workforce Solutions also offers; full agency management services, vendor-on premise, search and selection and payroll management services.

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