diff --git a/Modelica/Fluid/Utilities.mo b/Modelica/Fluid/Utilities.mo
index 22b29a21fd..1caf0f03d3 100644
--- a/Modelica/Fluid/Utilities.mo
+++ b/Modelica/Fluid/Utilities.mo
@@ -514,7 +514,7 @@ k1=1, k2=3 is shown in the next figure:
     by <a href=\"mailto:Martin.Otter@DLR.de\">Martin Otter</a>:<br>
     Designed and implemented.</li>
 <li><em>August 12, 2008</em>
-    by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>
+    by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>
     Minor modification to cover the limit case <code>x_small -> 0</code> without division by zero.</li>
 </ul>
 </html>",   info="<html>
@@ -724,9 +724,9 @@ for a smooth transition from y1 to y2.
 
     annotation (smoothOrder=1, Documentation(revisions="<html>
 <ul>
-<li><em>May 2008</em> by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>Designed and implemented.</li>
-<li><em>February 2011</em> by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>If the inflection point of the cubic S0 was at +/- infinity, the test criteria of <em>[Gasparo and Morandi, 1991]</em> result in division by zero. This case is handled properly now.</li>
-<li><em>March 2013</em> by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>If the arguments prescribed a degenerate case with points <code>(x0,y0)</code> and <code>(x1,y1)</code> on horizontal line, then return value <code>c</code> was undefined. This was corrected. Furthermore, an additional term was included for the computation of <code>y</code> in this case to assist automatic differentiation.</li>
+<li><em>May 2008</em> by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>Designed and implemented.</li>
+<li><em>February 2011</em> by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>If the inflection point of the cubic S0 was at +/- infinity, the test criteria of <em>[Gasparo and Morandi, 1991]</em> result in division by zero. This case is handled properly now.</li>
+<li><em>March 2013</em> by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>If the arguments prescribed a degenerate case with points <code>(x0,y0)</code> and <code>(x1,y1)</code> on horizontal line, then return value <code>c</code> was undefined. This was corrected. Furthermore, an additional term was included for the computation of <code>y</code> in this case to assist automatic differentiation.</li>
 </ul>
 </html>",   info="<html>
 <p>
@@ -824,7 +824,7 @@ The second graph shows the continuous derivative of this regularization function
     annotation(smoothOrder=3, Documentation(revisions="<html>
 <ul>
 <li><em>May 2008</em>
-    by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>
+    by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>
     Designed and implemented.</li>
 </ul>
 </html>"));
@@ -887,7 +887,7 @@ The second graph shows the continuous derivative of this regularization function
     annotation(smoothOrder=3, Documentation(revisions="<html>
 <ul>
 <li><em>May 2008</em>
-    by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>
+    by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>
     Designed and implemented.</li>
 </ul>
 </html>"));
diff --git a/Modelica/Media/package.mo b/Modelica/Media/package.mo
index ca65b66410..d4ac97a8e7 100644
--- a/Modelica/Media/package.mo
+++ b/Modelica/Media/package.mo
@@ -8302,7 +8302,7 @@ end BridgmansTablesForWater;
     by <a href=\"mailto:Martin.Otter@DLR.de\">Martin Otter</a>:<br>
     Designed and implemented.</li>
 <li><em>August 12, 2008</em>
-    by <a href=\"mailto:Michael.Sielemann@dlr.de\">Michael Sielemann</a>:<br>
+    by <a href=\"https://github.com/sielemann\">Michael Sielemann</a>:<br>
     Minor modification to cover the limit case <code>x_small -> 0</code> without division by zero.</li>
 </ul>
 </html>", info="<html>
