Gotta go with Aperture Science. Specifically, their marketing department. Sure, the research that goes on behind doors is tragic and disturbing... But portal technology, if properly marketed, could change the world.
Imagine. Portals where highway off/on ramps once stood. Portals to major cities in every airport. Hell, why not portals for home use? Planning on buying a couch, but got no way to transport it? Leave an open blue portal in the wall of your living room, then open an orange one at the furniture store.
It would revolutionize the concept of travel as we know it.