Some facts:
Steven Wilson is a self-taught producer and has taught himself to play various instruments including guitar and keyboard and bass guitar and flute whenever needed. He's also been involved with several different acts like Pendulum, King Crimson and Yes. People probably know Steven Wilson more for his work with Opeth and his collaboration with Mikael Akerfeldt during the Storm Corrosion days, but he's found a lot of success in other various ways such as...
On Dream Theater's Systematic Chaos release, Steven Wilson guest starred on the Repentance track.
Another noteworthy track that he's been involved with is on Pendulum's album Immersion titled The Fountain which in my opinion is such a fantastic track from start to finish, and Steven Wilson just makes it that much better.
Worth a listen if you're interested.