Marian Mankos, the founder of Electron Optica,  is an industry-wide recognized expert in electron beam technology.  He developed novel instrumentation and techniques in electron microscopy, lithography and holography and lead R&D teams at Etec Systems (Applied Materials) and KLA-Tencor. 

MEBS is a software company based in London (UK).  Its suite of electron-optical modeling software is considered industry standard and is used by the majority of U.S., European and Asian manufacturers of electron and ion beam equipment.

DELONG INSTRUMENTS is a manufacturing company based in Brno, Czech Republic, specializing in electron and X-ray microscopy, and vacuum technology.  It offers its own products, but mainly serves as a contract developer of unique custom made devices.