diff --git a/content/groups/accelerator.md b/content/groups/accelerator.md
index 9de8ae2..e2ff36b 100644
--- a/content/groups/accelerator.md
+++ b/content/groups/accelerator.md
@@ -1,7 +1,8 @@
 ---
 title: "Accelerator Workgroup"
 wgtype: sig
-chair: curtwollbrink
+chair:
+  - curtwollbrink
 members:
   - ibm
   - vantosh
diff --git a/content/groups/compliance.md b/content/groups/compliance.md
index 1a3e8d8..2d9d77f 100644
--- a/content/groups/compliance.md
+++ b/content/groups/compliance.md
@@ -1,7 +1,8 @@
 ---
 title: "Compliance Workgroup"
 wgtype: twg
-chair: sandywoodward
+chair:
+  - sandywoodward
 members:
   - ibm
   - yadro
diff --git a/content/groups/hpc.md b/content/groups/hpc.md
index c7e2f00..9d60dac 100644
--- a/content/groups/hpc.md
+++ b/content/groups/hpc.md
@@ -1,7 +1,8 @@
 ---
 title: "High-Performance-Computing Workgroup"
 wgtype: sig
-chair: allancantle
+chair:
+  - allancantle
 members:
   - allancantle
   - ibm
diff --git a/content/groups/isa.md b/content/groups/isa.md
index 47a65c2..8434efd 100644
--- a/content/groups/isa.md
+++ b/content/groups/isa.md
@@ -1,7 +1,8 @@
 ---
 title: "Instruction Set Architecture Workgroup"
 wgtype: twg
-chair: paulmackerras
+chair:
+  - paulmackerras
 members:
   - ibm
   - yadro
diff --git a/content/groups/librebmc.md b/content/groups/librebmc.md
index 93fed6b..4552a87 100644
--- a/content/groups/librebmc.md
+++ b/content/groups/librebmc.md
@@ -1,7 +1,9 @@
 ---
 title: "LibreBMC SIG"
 wgtype: sig
-chair: paullecocq
+chair:
+  - toddrosendahl
+  - karolgugala
 members:
   - ibm
   - google
diff --git a/content/groups/machinelearning.md b/content/groups/machinelearning.md
index 72728f9..36d7e13 100644
--- a/content/groups/machinelearning.md
+++ b/content/groups/machinelearning.md
@@ -1,7 +1,9 @@
 ---
 title: "Machine Learning AI Work Group"
 wgtype: sig
-chair: lionelclavien
+chair:
+  - lionelclavien
+  - kipwarner
 members:
   - innoboost
   - google
diff --git a/content/groups/memory.md b/content/groups/memory.md
index 3e1ffca..0bc993a 100644
--- a/content/groups/memory.md
+++ b/content/groups/memory.md
@@ -1,7 +1,9 @@
 ---
 title: "Memory Workgroup"
 wgtype: twg
-chair: pierreluccantin
+chair:
+  - pierreluccantin
+  - curtwollbrink
 members:
   - ibm
   - google
diff --git a/content/groups/powerpi.md b/content/groups/powerpi.md
index 67ba2bb..0ed6fa9 100644
--- a/content/groups/powerpi.md
+++ b/content/groups/powerpi.md
@@ -1,7 +1,8 @@
 ---
 title: "PowerPi Workgroup"
 wgtype: sig
-chair: yehowshuaimmanuel
+chair:
+  - alexeystepanov
 members:
   - ibm
   - yadro
diff --git a/content/groups/systemsoftware.md b/content/groups/systemsoftware.md
index 7d84903..1c229de 100644
--- a/content/groups/systemsoftware.md
+++ b/content/groups/systemsoftware.md
@@ -1,7 +1,8 @@
 ---
 title: "System Software TWG"
 wgtype: twg
-chair: michalzygowski
+chair:
+  - michalzygowski
 members:
   - ibm
   - vantosh
diff --git a/themes/openpowerfoundation/layouts/groups/single.html b/themes/openpowerfoundation/layouts/groups/single.html
index 69c5131..bf10898 100644
--- a/themes/openpowerfoundation/layouts/groups/single.html
+++ b/themes/openpowerfoundation/layouts/groups/single.html
@@ -20,17 +20,21 @@
 					<li>Workgroup Details :
 					<ul>
 					{{ if .Param "chair" }}
-						{{ $chairfile := printf "%s/%s" "persons" (.Param "chair") }}
-						{{ with $.Site.GetPage $chairfile }}
-							<li>Chair : <a href="{{ .Permalink }}">{{ .Title }}</a>
+						<li>Chair :<ul>
+						{{ range (.Param "chair") }}
+							{{ $chairfile := printf "%s/%s" "persons" . }}
+							{{ with $.Site.GetPage $chairfile }}
+							<li><a href="{{ .Permalink }}">{{ .Title }}</a>
 							{{ if .Param "member" }}
 								{{ $memberfile := printf "%s/%s" "members" (.Param "member") }}
 								{{ with $.Site.GetPage $memberfile }}
 									(<a href="{{ .Permalink }}">{{ .Title }}</a>)
 								{{ end }}
 							{{ end }}
+							{{ end }}
 							</li>
 						{{ end }}
+						</ul></li>
 					{{ end }}
 					{{ if .Param "wgtype" }}
 						{{ $data := index $.Site.Data }}