First Assistant Director (1st AD)

The first assistant director (1st AD) runs the set. Despite the title, the job isn't creative apprenticeship to the director — it's operational command: building the shooting schedule, driving each day's work shot by shot, calling the roll, managing background actors, and owning on-set safety.

The 1st AD's foundational document is the schedule: breaking the script into strips (traditionally a physical strip board, now scheduling software), then sequencing shoot days around locations, cast availability, daylight, and money. A schedule that shoots all scenes at one location together — regardless of where they fall in the story — is the 1st AD's craft in action; it's also why films shoot wildly out of order.

On set, the 1st AD is the production's tempo. "Waiting on..." is the most expensive phrase in filmmaking, and the AD's whole job is making sure the next setup is ready before the current one ends. A strong 1st AD makes a director faster and a crew calmer; a weak one costs the production days it never gets back.

For writers, the AD's schedule is another place your page choices become money: scene count, location spread, and cast-heavy days set the number of shooting days — the single biggest driver of any below-the-line budget.