- "I'm Colonel Yularen. This is Captain Thrawn; Ensign Vanto; Officers Roenton and Brook. We're doing a routine spot-check of the dojos in the Federal District"
- ―Wullf Yularen introduces himself and his fellows to H'sishi
Brook was a human[1] officer[2] in the Imperial Security Bureau.[1] He accompanied Thrawn, Eli Vanto, Wullf Yularen, and Roenton to investigate that Yinchom Dojo for anti-Imperial sentiments and possible rebel activity.[2]