diff --git a/crc/api/approval.py b/crc/api/approval.py
index ffdd4fe0..c8cd6194 100644
--- a/crc/api/approval.py
+++ b/crc/api/approval.py
@@ -24,7 +24,8 @@ def get_approvals(everything=False):
 
 def get_approvals_for_study(study_id=None):
     db_approvals = ApprovalService.get_approvals_for_study(study_id)
-    approvals = [Approval.from_model(approval_model) for approval_model in db_approvals]
+    ldap_service = LdapService()
+    approvals = [Approval.from_model(approval_model, ldap_service) for approval_model in db_approvals]
     results = ApprovalSchema(many=True).dump(approvals)
     return results
 
diff --git a/crc/models/approval.py b/crc/models/approval.py
index b72ee19a..b6dab996 100644
--- a/crc/models/approval.py
+++ b/crc/models/approval.py
@@ -48,13 +48,12 @@ class ApprovalModel(db.Model):
 
 
 class Approval(object):
-    ldap_service = LdapService()
 
     def __init__(self, **kwargs):
         self.__dict__.update(kwargs)
 
     @classmethod
-    def from_model(cls, model: ApprovalModel):
+    def from_model(cls, model: ApprovalModel, ldap_service: LdapSchema):
         # TODO: Reduce the code by iterating over model's dict keys
         instance = cls()
         instance.id = model.id
@@ -73,8 +72,8 @@ class Approval(object):
         if model.study:
             instance.title = model.study.title
         try:
-            instance.approver = Approval.ldap_service.user_info(model.approver_uid)
-            instance.primary_investigator = Approval.ldap_service.user_info(model.study.primary_investigator_id)
+            instance.approver = ldap_service.user_info(model.approver_uid)
+            instance.primary_investigator = ldap_service.user_info(model.study.primary_investigator_id)
         except ApiError as ae:
             app.logger.error("Ldap lookup failed for approval record %i" % model.id)
 
diff --git a/crc/services/approval_service.py b/crc/services/approval_service.py
index b6605f7b..af2f86b0 100644
--- a/crc/services/approval_service.py
+++ b/crc/services/approval_service.py
@@ -9,6 +9,7 @@ from crc.models.approval import ApprovalModel, ApprovalStatus, ApprovalFile, App
 from crc.models.study import StudyModel
 from crc.models.workflow import WorkflowModel
 from crc.services.file_service import FileService
+from crc.services.ldap_service import LdapService
 
 
 class ApprovalService(object):
@@ -27,11 +28,12 @@ class ApprovalService(object):
             query=query.filter(ApprovalModel.status != ApprovalStatus.CANCELED.value)
 
         approvals = query.all()
+        ldap_service = LdapService()
         for approval_model in approvals:
             if approval_model.approver_uid == approver_uid:
-                main_approval = Approval.from_model(approval_model)
+                main_approval = Approval.from_model(approval_model, ldap_service)
             else:
-                related_approvals.append(Approval.from_model(approval_model))
+                related_approvals.append(Approval.from_model(approval_model, ldap_service))
         if not main_approval and len(related_approvals) > 0:
             main_approval = related_approvals[0]
             related_approvals = related_approvals[1:]
@@ -68,11 +70,12 @@ class ApprovalService(object):
     def get_approvals_for_study(study_id, include_cancelled=True):
         """Returns an array of Approval objects for the study, it does not
          compute the related approvals."""
+        ldap_service = LdapService()
         query = session.query(ApprovalModel).filter_by(study_id=study_id)
         if not include_cancelled:
             query = query.filter(ApprovalModel.status != ApprovalStatus.CANCELED.value)
         db_approvals = query.all()
-        return [Approval.from_model(approval_model) for approval_model in db_approvals]
+        return [Approval.from_model(approval_model, ldap_service) for approval_model in db_approvals]
 
 
     @staticmethod