The Samuelson Institute is an American "think tank" specializing in chemical weapons before shifting their research to the Devil Beast Syndrome.
After the first sighting of a Devil Beast, the Samuelson Institute had paired up with H.A. to research the effects of the Devil Beast Syndrome, often sending some of their scientists to H.A.'s headquarters in Japan. However by the middle of the series, it came under ownership of the NSA, forcing a break off from H.A. due to ethical standards.