Wikipedia
Busek
Busek Co. Inc. is a spacecraft propulsion company providing thrusters, electronics, and complete systems for spacecraft.
Busek spaceflight heritage includes the first US Hall thruster in space ( TacSat-2), the first electrospray thruster in space ( LISA Pathfinder), four micro- pulsed plasma thrusters flown aboard FalconSat-3, and a BHT-200 Hall thruster flown aboard FalconSat-5.