This chapter introduces the various job positions in theatrical sound and explains the hierarchies and role expectations. The positions covered are sound designer, associate designer, assistant designer, production sound, A1 or head sound, A2 or deck sound, and monitor mixer, and the author is careful to delineate the sometimes subtle differences in the roles and duties belonging to each position. Each of the positions is broken down further in its roles, distinguishing between such aspects as musical theatre sound vs. straight play sound, and technical sound vs. conceptual sound. Level of experience needed for each position is also discussed, and some examples of well-known names of people filling each type of position are given. Keywords A1/head sound, A2/deck sound, assistant sound designer, associate sound designer, conceptual sound design, head sound, monitor mixer, musical theatre sound designer, production sound, theatre sound designer, sound engineer, sound mixer, sound operator, straight play sound designer, technical sound design, theatre sound score design, theatre sound system design