Developer of the Rapid Development Methodology (RDM), Gref is a technologist and systems engineer who has done pioneering work in missile systems; command, control and communications (C3) systems; and satellite systems. He and Dr. William Spuck developed RDM, which has been employed in the development of a number of C3 systems for the U.S. Department of Defense.
RDM is a form of software development classified as iterative and incremental development. A primary distinction of RDM is that the user is left with a usable capability at the end of every iteration. Gref pioneered the development of C3 systems using the Ada programming language.
He has coauthored a number of reports as a member of the Army Science Board (ASB) and as a committee member for the Naval Studies Board of the United States National Academy of Sciences.
