diff --git a/app/Actions/Schools/SetHeadDirector.php b/app/Actions/Schools/SetHeadDirector.php
index 75377e7..e699061 100644
--- a/app/Actions/Schools/SetHeadDirector.php
+++ b/app/Actions/Schools/SetHeadDirector.php
@@ -3,7 +3,6 @@
 namespace App\Actions\Schools;
 
 use App\Exceptions\AuditionAdminException;
-use App\Models\School;
 use App\Models\User;
 
 use function auditionLog;
@@ -15,9 +14,9 @@ class SetHeadDirector
     {
     }
 
-    public function __invoke(User $user, School $school): void
+    public function __invoke(User $user): void
     {
-        $this->setHeadDirector($user, $school);
+        $this->setHeadDirector($user);
     }
 
     /**
@@ -25,6 +24,10 @@ class SetHeadDirector
      */
     public function setHeadDirector(User $user): void
     {
+        if (! User::where('id', $user->id)->exists()) {
+            throw new AuditionAdminException('User does not exist');
+        }
+
         if (is_null($user->school_id)) {
             throw new AuditionAdminException('User is not associated with a school');
         }
diff --git a/tests/Feature/app/Actions/Schools/SetHeadDirectorTest.php b/tests/Feature/app/Actions/Schools/SetHeadDirectorTest.php
new file mode 100644
index 0000000..5d6aa90
--- /dev/null
+++ b/tests/Feature/app/Actions/Schools/SetHeadDirectorTest.php
@@ -0,0 +1,61 @@
+<?php
+
+use App\Actions\Schools\SetHeadDirector;
+use App\Exceptions\AuditionAdminException;
+use App\Models\School;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    $this->school = School::factory()->create();
+    $this->user = User::factory()->create();
+});
+
+it('makes a user the head director at a school', function () {
+    $this->user->school_id = $this->school->id;
+    $this->user->save();
+    $promoter = app(SetHeadDirector::class);
+    $promoter($this->user);
+    expect($this->user->hasFlag('head_director'))->toBeTrue();
+});
+
+it('throws an exception if the user does not exist', function () {
+    $newUser = User::factory()->make();
+    $promoter = app(SetHeadDirector::class);
+    $promoter($newUser);
+})->throws(AuditionAdminException::class, 'User does not exist');
+
+it('throws an exception if the user is not associated with a school', function () {
+    $promoter = app(SetHeadDirector::class);
+    $promoter($this->user);
+})->throws(AuditionAdminException::class, 'User is not associated with a school');
+
+it('removes any other head directors at their school', function () {
+    $this->user->school_id = $this->school->id;
+    $this->user->save();
+    $otherUser = User::factory()->create();
+    $otherUser->school_id = $this->school->id;
+    $otherUser->save();
+    $promoter = app(SetHeadDirector::class);
+    $promoter($this->user);
+    $this->user->refresh();
+    $otherUser->refresh();
+    expect($otherUser->hasFlag('head_director'))->toBeFalse()
+        ->and($this->user->hasFlag('head_director'))->toBeTrue();
+    $promoter($otherUser);
+    $this->user->refresh();
+    $otherUser->refresh();
+    expect($otherUser->hasFlag('head_director'))->toBeTrue()
+        ->and($this->user->hasFlag('head_director'))->toBeFalse();
+});
+
+it('logs the head director promotion', function () {
+    $this->user->school_id = $this->school->id;
+    $this->user->save();
+    $promoter = app(SetHeadDirector::class);
+    $promoter($this->user);
+    $logEntry = \App\Models\AuditLogEntry::latest()->first();
+    expect($logEntry->message)->toEqual('Set '.$this->user->full_name().' as head director at '.$this->school->name);
+});