Members
- Current members
- Jim Matheos (Fates Warning) – guitars, keyboards, programming
- Kevin Moore (Chroma Key, ex-Dream Theater) – vocals, keyboards, programming
- Former members
- Mike Portnoy (ex-Dream Theater) – drums on Office of Strategic Influence as a full band member and on Free as a session musician
- Guest musicians
- Gavin Harrison (Porcupine Tree) – drums on Blood and Fire Make Thunder
- Sean Malone (Gordian Knot, Cynic) – bass, Chapman Stick on Office of Strategic Influence
- Joey Vera (Fates Warning) – bass on Free
- Steven Wilson (Porcupine Tree) – vocals on the track "shutDOWN" on Office of Strategic Influence
- Tim Bowness (No-Man) – vocals on the track "No Celebrations" on Blood
- Mikael Åkerfeldt (Opeth) – vocals on the track "Stockholm" on Blood
Read more about this topic: OSI (band)
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