Marc J. Rochkind invented the Source Code Control System while working at Bell Labs,[1] as well as wrote Advanced UNIX Programming, and founded XVT Software.
The Source Code Control System (SCCS) was the first modern revision control system. SCCS was developed by Rochkind in 1972 at Bell Labs.[2] By 1975 it was in wide use within Bell Labs and soon became a popular Software Configuration Management tool in the computer industry.[3] SCCS was the first commercially available revision control system to use deltas for the storage of revisions (IBM's internal CLEAR-CASTER system used deltas since 1968). SCCS was originally developed for the IBM 370 machine but quickly became a staple of UNIX, beginning with the Programmer's Workbench version of UNIX.