diff --git a/caper/caper.py b/caper/caper.py
index 438d4d28..831da007 100644
--- a/caper/caper.py
+++ b/caper/caper.py
@@ -17,6 +17,7 @@
 
 from pyhocon import ConfigFactory, HOCONConverter
 import os
+import pwd
 import json
 import re
 import time
@@ -79,6 +80,7 @@ class Caper(object):
     SEC_INTERVAL_UPDATE_METADATA = 240.0
     # added to cromwell labels file
     KEY_CAPER_STR_LABEL = 'caper-str-label'
+    KEY_CAPER_USER = 'caper-user'
     KEY_CAPER_BACKEND = 'caper-backend'
     TMP_FILE_BASENAME_METADATA_JSON = 'metadata.json'
     TMP_FILE_BASENAME_WORKFLOW_OPTS_JSON = 'workflow_opts.json'
@@ -100,6 +102,7 @@ def __init__(self, args):
         # self._keep_temp_backend_file = args.get('keep_temp_backend_file')
         self._hold = args.get('hold')
         self._format = args.get('format')
+        self._hide_result_before = args.get('hide_result_before')
         self._disable_call_caching = args.get('disable_call_caching')
         self._max_concurrent_workflows = args.get('max_concurrent_workflows')
         self._max_concurrent_tasks = args.get('max_concurrent_tasks')
@@ -421,6 +424,11 @@ def list(self):
         for w in workflows:
             row = []
             workflow_id = w['id'] if 'id' in w else None
+            submission = w['submission']
+
+            if self._hide_result_before is not None:
+                if submission <= self._hide_result_before:
+                    continue
             for f in formats:
                 if f == 'workflow_id':
                     row.append(str(workflow_id))
@@ -429,6 +437,11 @@ def list(self):
                         workflow_id,
                         Caper.KEY_CAPER_STR_LABEL)
                     row.append(str(lbl))
+                elif f == 'user':
+                    lbl = self._cromwell_rest_api.get_label(
+                        workflow_id,
+                        Caper.KEY_CAPER_USER)
+                    row.append(str(lbl))
                 else:
                     row.append(str(w[f] if f in w else None))
             print('\t'.join(row))
@@ -691,6 +704,8 @@ def __create_labels_json_file(
         if self._str_label is not None:
             labels_dict[Caper.KEY_CAPER_STR_LABEL] = \
                 self._str_label
+        username = pwd.getpwuid(os.getuid())[0]
+        labels_dict[Caper.KEY_CAPER_USER] = username
 
         labels_file = os.path.join(directory, fname)
         with open(labels_file, 'w') as fp:
diff --git a/caper/caper_args.py b/caper/caper_args.py
index d4cc07ae..baaa63e8 100644
--- a/caper/caper_args.py
+++ b/caper/caper_args.py
@@ -23,7 +23,7 @@
 DEFAULT_MAX_RETRIES = 1
 DEFAULT_PORT = 8000
 DEFAULT_IP = 'localhost'
-DEFAULT_FORMAT = 'id,status,name,str_label,submission'
+DEFAULT_FORMAT = 'id,status,name,str_label,user,submission'
 DEFAULT_DEEPCOPY_EXT = 'json,tsv'
 DEFAULT_CAPER_CONF_CONTENTS = """[defaults]
 
@@ -142,7 +142,12 @@
 
 ############# Misc. settings
 ## list workflow format
-#format=id,status,name,str_label,submission
+#format=id,status,name,str_label,user,submission
+
+## hide workflows submitted before
+## use the same date/time format as shown in "caper list"
+## e.g. 2019-06-13, 2019-06-13T10:07
+#hide-result-before=
 
 ## for troubleshooting, show successully completed tasks too
 #show-completed-task=True
@@ -424,9 +429,16 @@ def parse_caper_arguments():
         'subcommand. Any key name in workflow JSON from Cromwell '
         'server\'s response is allowed. '
         'Available keys are "id" (workflow ID), "status", "str_label", '
-        '"name" (WDL/CWL name), "submission" (date/time), "start", "end". '
+        '"name" (WDL/CWL name), "submission" (date/time), "start", '
+        '"end" and "user". '
         '"str_label" is a special key for Caper. See help context '
         'of "--str-label" for details')
+    parent_list.add_argument(
+        '--hide-result-before',
+        help='Hide workflows submitted before this date/time. '
+             'Use the same (or shorter) date/time format shown in '
+             '"caper list". '
+             'e.g. 2019-06-13, 2019-06-13T10:07')
     # troubleshoot
     parent_troubleshoot = argparse.ArgumentParser(add_help=False)
     parent_troubleshoot.add_argument(