The Sarge is an ex-Federal Navy specialist and engineer. He develops limpets and cannons. He's allied with the Federation and his home system is Beta-3 Tucani.
No one knows The Sarge's real name and he won't reveal it, even to close friends. He's an ex-Federal Navy specialist who worked closely with the now defunct Colonial Drones Corporation, and later with the drone division of Core Dynamics, in tweaking drone controllers and long range patrol support systems. His reputation is such that he's attracted followers who learn from him and have built up a range of facilities around his initially modest operations.
List of modifications is available at INARA site.