diff --git a/attn/pel/user_header.cpp b/attn/pel/user_header.cpp
new file mode 100644
index 0000000..23238e8
--- /dev/null
+++ b/attn/pel/user_header.cpp
@@ -0,0 +1,48 @@
+#include "user_header.hpp"
+
+namespace attn
+{
+namespace pel
+{
+
+UserHeader::UserHeader(Stream& pel)
+{
+    unflatten(pel);
+}
+
+void UserHeader::flatten(Stream& stream) const
+{
+    stream << _header << _eventSubsystem << _eventScope << _eventSeverity
+           << _eventType << _reserved4Byte1 << _problemDomain << _problemVector
+           << _actionFlags << _reserved4Byte2;
+}
+
+void UserHeader::unflatten(Stream& stream)
+{
+    stream >> _header >> _eventSubsystem >> _eventScope >> _eventSeverity >>
+        _eventType >> _reserved4Byte1 >> _problemDomain >> _problemVector >>
+        _actionFlags >> _reserved4Byte2;
+}
+
+void UserHeader::setSubsystem(uint8_t subsystem)
+{
+    _eventSubsystem = subsystem;
+}
+
+void UserHeader::setSeverity(uint8_t severity)
+{
+    _eventSeverity = severity;
+}
+
+void UserHeader::setType(uint8_t type)
+{
+    _eventType = type;
+}
+
+void UserHeader::setAction(uint16_t action)
+{
+    _actionFlags = action;
+}
+
+} // namespace pel
+} // namespace attn