ESI was formed in 1988 by Rick Dirienzo and Ed Quinlan, who worked together at R.G. Vanderweil Engineers and HEC Energy Corporation. The company’s third partner, Jack Nelson, joined the group in 2001, after serving as Area Manager and Regional Systems Specialist for Carrier Corporation. Driven to build a successful firm based on their personal principles, the three Principals are committed to engineering excellence, outstanding client service and environmental sustainability.
An early adopter of energy conscious design, ESI has worked with Boston and Providence area clients in a broad range of industries for nearly 30 years. Our experienced design professionals are committed to engineering excellence and client service—providing direct senior-level engineering involvement through all project phases for superior results.