Simmons & Company International | Energy Specialists of Piper Jaffray is one of the largest and most experienced energy investment banking teams in the industry, offering M&A advisory, capital markets execution and investment research.The energy Infrastructure sector includes companies that provide services to build or maintain large and critical assets, such as pipelines, refineries, power generation facilities and processing plants. Services provided by companies in this sector include: engineering, design, construction, procurement, inspection and remediation.