Sullivan Interests


A Family of Companies


While Sullivan Interests' portfolio companies are based along the Texas Gulf Coast, additional locations in Louisiana, Alabama, Florida, South Carolina, North Carolina, New York, Puerto Rico, and the U.S. Virgin Islands offer the capability to engage in both domestic and international projects.   Texas International Terminals, Ltd. offers multimodal liquid and dry bulk handling on the Galveston Ship Channel, while Callan Marine, Ltd.  provides heavy marine construction services and dredging.  SLSCO Ltd. provides comprehensive site services for disaster response and recovery, infrastructure and commercial construction and commercial landscaping. Energyguard Foam Insulators, L.P. offers spray-foam insulation services around the state of Texas.  Sullivan Brothers Builders, Ltd., is identified as one of the most reputable residential builders in Southeast Texas, showcasing Evia on Galveston Island and Harper Woods, Ltd. in Springwoods Village. The most recent company, GCC Bunkers, is a physical supplier of marine fuel in the Houston/Galveston area, and is primarily focused on the supply of low sulfur fuel oil (RMD 80 0.1% sulfur and DMA 0.10% sulfur) as a solution to ECA compliance requirements. In addition, GCC Bunkers will supply all other standard specification marine fuels and distillates to ship owners and operators calling on the Houston/Galveston area.

The greatest compliment a company can receive is from its clients – as a result of the diversity of Sullivan Interests' portfolio companies, our team is routinely acknowledged for their capability to respond to the needs of their customers and provide timely and cost-effective completion of their assignments/projects. Sullivan Interests was created when the Sullivan Brothers (Billy, Todd and John) started a lawn mowing and tree service to earn their college tuition.  Sullivan Interests continues to emulate that same spirit of tenacity, commitment and customer service just as the Sullivan Brothers did when they mowed their first lawn. 





Todd P. Sullivan earned a degree in Petroleum Engineering from Texas A&M University and began his career in the oil and gas industry where his primary focus was in production forecasting and reserves valuations. He left his engineering career to pursue various business interests with his brothers, which led to the diversification of Sullivan Interests, Ltd. into broad-based land development, industrial and service related companies. Todd oversees the management and operation of Texas International Terminals, Ltd.  and leverages his background in the oil and gas industry to foster business opportunities for the heavy industrial focused companies within the portfolio.




John R. Sullivan earned a degree in Construction Management from Texas A&M University and has vast experience in all aspects of the construction industry, ranging from marine construction and dredging, land development and infrastructure construction as well as the intricate completion of individual custom homes. John oversees the daily operations of Sullivan Brothers Builders, Ltd. as well as Callan Marine, Ltd.




William W. (Billy) Sullivan is the President of SLSCO, Ltd and is responsible for the management and operation of the various projects around the country. His scope of responsibility is broad and includes business development, project start-up, as well as the regulatory process and execution of disaster response and recovery projects. Billy earned a degree in Finance from Texas A&M University, where he was a member of the Corps of Cadets.

 With over 20 years of experience in construction and development, Billy has lead the execution of more than 6,000 home construction/repairs in the past decade. Some of the most notable assignments include large-scale housing programs for the State of Texas, City of New York, State of Louisiana, State of South Carolina and serving many other clients such as FEMA and HUD. He is currently leading operations in Puerto Rico and the U.S. Virgin Islands, regions that were devastated by Hurricane Maria and Irma in 2017.