diff --git a/lib/Tuba.pm b/lib/Tuba.pm
index 58c36af5..b43a6aa3 100644
--- a/lib/Tuba.pm
+++ b/lib/Tuba.pm
@@ -398,6 +398,9 @@ sub startup {
     $r->get("/model_run/:model_identifier/:scenario_identifier/:range_start/:range_end/:spatial_resolution/:time_resolution/:sequence")
         ->to("model_run#lookup")->name('model_run_lookup');
 
+    # Roles
+    $r->resource('role_type');
+
     # Lexicons
     $r->resource('lexicon');
     my $lex = $r->lookup('select_lexicon');
diff --git a/lib/Tuba/Controller.pm b/lib/Tuba/Controller.pm
index 3441eb56..67459218 100644
--- a/lib/Tuba/Controller.pm
+++ b/lib/Tuba/Controller.pm
@@ -62,13 +62,17 @@ sub common_tree_fields {
     );
 }
 
+sub _default_list_order {
+    return "identifier";
+}
+
 sub list {
     my $c = shift;
     my $objects = $c->stash('objects');
     my $all = $c->param('all') ? 1 : 0;
     unless ($objects) {
         my $manager_class = $c->stash('manager_class') || $c->_guess_manager_class;
-        $objects = $manager_class->get_objects(sort_by => "identifier", $all ? () : (page => $c->page, per_page => $c->per_page));
+        $objects = $manager_class->get_objects(sort_by => $c->_default_list_order, $all ? () : (page => $c->page, per_page => $c->per_page));
         $c->set_pages($manager_class->get_objects_count) unless $all;
     }
     my $object_class = $c->stash('object_class') || $c->_guess_object_class;
diff --git a/lib/Tuba/Organization.pm b/lib/Tuba/Organization.pm
index bfd8c0e4..3b7e2546 100644
--- a/lib/Tuba/Organization.pm
+++ b/lib/Tuba/Organization.pm
@@ -19,6 +19,24 @@ sub show {
     return $c->SUPER::show(@_);
 }
 
+sub list {
+    my $c = shift;
+    my @q;
+    my $role;
+    if (my $r = $c->param('role')) {
+        @q = (query => [role_type_identifier => $r, person_id => undef], with_objects => [qw/contributors/]);
+        $role = RoleType->new(identifier => $r)->load(speculative => 1);
+    }
+    $c->stash(role => $role);
+    if ($c->param('all')) {
+        $c->stash(objects => Organizations->get_objects(@q));
+    } else {
+        $c->stash(objects => scalar Organizations->get_objects(@q, sort_by => 'name', page => $c->page));
+        $c->set_pages(Organizations->get_objects_count(@q));
+    }
+    $c->SUPER::list(@_);
+}
+
 sub update_rel {
     my $c = shift;
     my $org = $c->_this_object;
diff --git a/lib/Tuba/Person.pm b/lib/Tuba/Person.pm
index fc39357c..6cca36d0 100644
--- a/lib/Tuba/Person.pm
+++ b/lib/Tuba/Person.pm
@@ -11,11 +11,18 @@ use Tuba::DB::Objects qw/-nicknames/;
 
 sub list {
     my $c = shift;
+    my @q;
+    my $role;
+    if (my $r = $c->param('role')) {
+        @q = (query => [role_type_identifier => $r], with_objects => [qw/contributors/]);
+        $role = RoleType->new(identifier => $r)->load(speculative => 1);
+    }
+    $c->stash(role => $role);
     if ($c->param('all')) {
-        $c->stash(objects => Persons->get_objects);
+        $c->stash(objects => Persons->get_objects(@q));
     } else {
-        $c->stash(objects => scalar Persons->get_objects(sort_by => 'last_name, first_name', page => $c->page));
-        $c->set_pages(Persons->get_objects_count);
+        $c->stash(objects => scalar Persons->get_objects(@q, sort_by => 'last_name, first_name', page => $c->page));
+        $c->set_pages(Persons->get_objects_count(@q));
     }
     $c->SUPER::list(@_);
 }
diff --git a/lib/Tuba/RoleType.pm b/lib/Tuba/RoleType.pm
new file mode 100644
index 00000000..3952f9ab
--- /dev/null
+++ b/lib/Tuba/RoleType.pm
@@ -0,0 +1,42 @@
+=head1 NAME
+
+Tuba::RoleType : Controller class for roles.
+
+=cut
+
+package Tuba::RoleType;
+use Mojo::Base qw/Tuba::Controller/;
+use Tuba::DB::Objects qw/-nicknames/;
+
+sub _default_list_order {
+    return "identifier";
+}
+
+=head1 show
+
+Show metadata about a role.
+
+=cut
+
+sub show {
+    my $c = shift;
+    my $identifier = $c->stash('role_type_identifier');
+    my $meta = RoleType->meta;
+    my $object = RoleType->new( identifier => $identifier )
+      ->load( speculative => 1 ) or return $c->reply->not_found;
+    $c->stash(object => $object);
+    $c->stash(meta => $meta);
+    my $stats = $c->dbs->query(<<SQL,$identifier)->hashes->[0];
+select
+    count(nullif(person_id is null,true)) as people,
+    count(nullif(person_id is null,false)) as orgs
+from contributor
+where role_type_identifier = ?
+SQL
+    $c->stash(stats => $stats);
+    $c->SUPER::show(@_);
+}
+
+
+1;
+
diff --git a/lib/Tuba/files/templates/organization/objects.html.ep b/lib/Tuba/files/templates/organization/objects.html.ep
index 6a5ca310..3dc1961e 100644
--- a/lib/Tuba/files/templates/organization/objects.html.ep
+++ b/lib/Tuba/files/templates/organization/objects.html.ep
@@ -3,7 +3,11 @@
 
 <center>
 <h2>
-    %= (stash 'plural') || ucfirst($meta->table) .'s'
+% if ($role) {
+<h2>Organizations <small>who have had the role <b><%= $role->label %></b></small></h2>
+% } else {
+<h2>Organizations</h2>
+% }
 </h2>
 </center>
 
diff --git a/lib/Tuba/files/templates/person/objects.html.ep b/lib/Tuba/files/templates/person/objects.html.ep
index 06d5baf3..74c5f49d 100644
--- a/lib/Tuba/files/templates/person/objects.html.ep
+++ b/lib/Tuba/files/templates/person/objects.html.ep
@@ -2,7 +2,11 @@
 % layout 'default';
 
 <center>
-<h2>People </h2>
+% if ($role) {
+<h2>People <small>who have had the role <b><%= $role->label %></b></small></h2>
+% } else {
+<h2>People</h2>
+% }
 </center>
 
 %= include 'list_formats';
diff --git a/lib/Tuba/files/templates/role_type/object.html.ep b/lib/Tuba/files/templates/role_type/object.html.ep
new file mode 100644
index 00000000..552e7971
--- /dev/null
+++ b/lib/Tuba/files/templates/role_type/object.html.ep
@@ -0,0 +1,32 @@
+
+% layout 'default', title => "Role ".$role_type->label;
+
+<center>
+<h2><%= $role_type->label %></h2>
+</center>
+
+% if (user_can('update')) {
+%= include 'history_modal';
+
+<span style='float:right;'>
+<%= link_to obj_uri_for($object,'update_form') => class => "btn" => begin %>edit<%= end %>
+<a href="#myModal" role="button" class="btn" data-toggle="modal">history</a>
+</span>
+% }
+
+<div class='row-fluid'>
+<div class='well span6 offset3'>
+    <center><b>role identifier: <%= $role_type->identifier %></b></center>
+    Organizations:
+    <%= link_to url_for('list_organization')->query(role => $role_type_identifier) => begin %>
+    <%= $stats->{orgs} %><br>
+    <%= end %>
+    People:
+    <%= link_to url_for('list_person')->query(role => $role_type_identifier) => begin %>
+    <%= $stats->{people} %><br>
+    <%= end %>
+</div>
+</div>
+
+<%= include 'h/other_formats'; =%>
+
diff --git a/lib/Tuba/files/templates/role_type/objects.html.ep b/lib/Tuba/files/templates/role_type/objects.html.ep
new file mode 100644
index 00000000..18fa78a7
--- /dev/null
+++ b/lib/Tuba/files/templates/role_type/objects.html.ep
@@ -0,0 +1,37 @@
+
+% layout 'default';
+
+<center>
+<h2>
+    Role Types
+</h2>
+</center>
+
+%= include 'list_formats';
+
+% if (my $page = stash 'page') {
+%= include 'pager', page => $page;
+% }
+<table class='table table-condensed table-bordered table-striped'>
+<caption>
+</caption>
+<tr>
+    <th>Identifier</th>
+    <th>Label</th>
+</th>
+</tr>
+% for my $o (@$objects) {
+    <tr>
+        <td>
+            %= link_to $o->uri($self) => begin
+            <%= $o->identifier %>
+            %= end
+        </td>
+        <td><%= $o->label %></td>
+    </tr>
+% }
+</table>
+% if (my $page = stash 'page') {
+%= include 'pager', page => $page, bottom => 1;
+% }
+