The original design and implementation of LWP was done by Larry Raper. The first versions of LWP were operational in early 1984. Since then LWP has been and is being used by several groups both inside and outside Carnegie Mellon University. This makes it somewhat difficult to create a consistent list of others who have contributed, ported, and patched their way through LWP over the years. It would probably make a nice project for a history grad student.