Brussee is swapping his role as technical director at the Amsterdam-based developer for an executive producer position on an "ambitious" unannounced project being made in California.
In an email sent to Guerrilla staff, which was obtained by Control Online (via Edge), Brussee confirmed his departure and thanked his colleagues for their hard work on games including the original Killzone and Shellshock: Nam '67, for "actually realising Killzone 2 after that infamous trailer", and for making Killzone 3 in two years.
"It has been a great ride," he said. "Every year there was something ambitious, new and inspiring to put my energy into. For me, I now want to find a new personal challenge, and who knows where this will take me next."