 Core competencies of the combined ESL, TRW and Northrop Grumman units include systems integration, high-performance signal processing algorithms, high-speed architectures, remotely controlled modular payloads and antenna systems.ESL survives essentially intact in their San Jose facility and the former McClellan Air Force Base facility in Sacramento.In February 1988, former employee Richard Farley fatally shot seven people and wounded four others at the company's headquarters after years of stalking former co-worker Laura Black.