|Key people||Phillip (Terry) Ragon, founder and CEO|
InterSystems Corporation is a privately held vendor of software systems and technology for high-performance database management, rapid application development, integration, and healthcare information systems. The vendor's products are the InterSystems Caché DBMS and application development environment, the Ensemble integration platform, DeepSee embedded real-time business intelligence, and the HealthShare healthcare informatics platform. InterSystems also sells the TrakCare healthcare information system outside the United States.
InterSystems is based in Cambridge, Massachusetts. The company has sales offices in Australia, Belgium, Brazil, Chile, China, Czech Republic, Finland, France, Germany, Israel, Italy, Japan, Netherlands, Russia, South Africa, Spain, Sweden, Switzerland, Thailand, United Arab Emirates, and the United Kingdom.
InterSystems was founded in 1978 by Phillip T. (Terry) Ragon, its current CEO as of 2013. InterSystems was one of the original vendors of M-technology (aka MUMPS) systems, with a product called ISM. Over the years, InterSystems acquired several other MUMPS implementations: DTM from Data Tree (1993); DSM from Digital (1995); and MSM from Micronetics (1998); making InterSystems the dominant M technology vendor. InterSystems eventually started combining features from these products into one they called OpenM. InterSystems launched Caché in 1997. At that time they stopped new development for all of their legacy M-based products (although the company stills supports existing customers who use them). They launched Ensemble in 2003 and HealthShare in 2006. In 2007, InterSystems purchased TrakHealth, an Australian vendor of TrakCare, a modular healthcare information system that is based on InterSystems’ technology. DeepSee, a real-time business intelligence system implemented in Caché, was launched in 2008. In May 2011, InterSystems launched Globals as a free database based on the multi-dimensional array storage technology used in Caché. In September 2011, InterSystems purchased Siemens Health Services (SHS) France from its Siemens parent company. SHS will operate as “InterSystems SAS”.
On August 14, 2008, the Boston Globe reported that InterSystems was filing a lawsuit against Microsoft Corporation, another tenant in its Cambridge, Mass., headquarters, seeking to prevent Microsoft from expanding in the building. InterSystems also filed a lawsuit against building owner Equity Office Partners, a subsidiary of the Blackstone Group, "contending that it conspired with Microsoft to lease space that InterSystems had rights to, and sought to drive up rents in the process." 
The company's products include:
- InterSystems Caché, an object database;
- InterSystems Ensemble, a rapid integration and development platform;
- InterSystems HealthShare, a health information exchange platform;
- and InterSystems TrakCare, a Web-based healthcare information system.
- "InterSystems press release".
- Ross, Casey (August 14, 2008). "For Microsoft, not all is neighborly in Cambridge". The Boston Globe. Retrieved 2008-10-25.
- "InterSystems Products".