diff --git a/indico/modules/events/schemas.py b/indico/modules/events/schemas.py
index 7e54a59e9..f799e5f98 100644
--- a/indico/modules/events/schemas.py
+++ b/indico/modules/events/schemas.py
@@ -16,9 +16,14 @@

 from __future__ import unicode_literals

+from marshmallow import fields
+
 from indico.core.marshmallow import mm


 class PersonLinkSchema(mm.Schema):
+    author_type = fields.Function(lambda obj: None if obj.author_type.name == 'none' else obj.author_type.name)
+
     class Meta:
-        fields = ('id', 'person_id', 'email', 'first_name', 'last_name', 'title', 'affiliation', 'address', 'phone')
+        additional = ('id', 'person_id', 'email', 'first_name', 'last_name', 'title', 'affiliation', 'address',
+                      'phone', 'is_speaker')