diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index 215239d66..b0a7e0d45 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -1016,6 +1016,29 @@ class ContactAdmin(ListHeaderAdmin, ImportExportModelAdmin):
         # Get the filtered values
         return super().changelist_view(request, extra_context=extra_context)
 
+class SeniorOfficialAdmin(ListHeaderAdmin, ImportExportModelAdmin):
+    """Custom Senior Official Admin class."""
+
+    # NOTE: these are just placeholders.  Not part of ACs (haven't been defined yet).  Update in future tickets.
+    search_fields = ["first_name", "last_name"]
+    search_help_text = "Search by first name or last name."
+    list_display = [
+        "last_name",
+    ]
+
+    # this ordering effects the ordering of results
+    # in autocomplete_fields for user
+    ordering = ["first_name", "last_name"]
+
+    fieldsets = [
+        (
+            None,
+            {"fields": ["first_name", "last_name", "title", "phone"]},
+        )
+    ]
+
+
+
 
 class WebsiteResource(resources.ModelResource):
     """defines how each field in the referenced model should be mapped to the corresponding fields in the
@@ -1025,6 +1048,7 @@ class WebsiteResource(resources.ModelResource):
         model = models.Website
 
 
+
 class WebsiteAdmin(ListHeaderAdmin, ImportExportModelAdmin):
     """Custom website admin class."""
 
@@ -2679,6 +2703,7 @@ admin.site.register(models.DomainRequest, DomainRequestAdmin)
 admin.site.register(models.TransitionDomain, TransitionDomainAdmin)
 admin.site.register(models.VerifiedByStaff, VerifiedByStaffAdmin)
 admin.site.register(models.Portfolio, PortfolioAdmin)
+admin.site.register(models.SeniorOfficial, SeniorOfficialAdmin)
 
 # Register our custom waffle implementations
 admin.site.register(models.WaffleFlag, WaffleFlagAdmin)
diff --git a/src/registrar/models/__init__.py b/src/registrar/models/__init__.py
index b2cffaf32..370eb2fa5 100644
--- a/src/registrar/models/__init__.py
+++ b/src/registrar/models/__init__.py
@@ -17,6 +17,7 @@ from .transition_domain import TransitionDomain
 from .verified_by_staff import VerifiedByStaff
 from .waffle_flag import WaffleFlag
 from .portfolio import Portfolio
+from .senior_official import SeniorOfficial
 
 
 __all__ = [
@@ -38,6 +39,7 @@ __all__ = [
     "VerifiedByStaff",
     "WaffleFlag",
     "Portfolio",
+    "SeniorOfficial",
 ]
 
 auditlog.register(Contact)
diff --git a/src/registrar/models/portfolio.py b/src/registrar/models/portfolio.py
index a05422960..931b56405 100644
--- a/src/registrar/models/portfolio.py
+++ b/src/registrar/models/portfolio.py
@@ -38,6 +38,14 @@ class Portfolio(TimeStampedModel):
         default=FederalAgency.get_non_federal_agency,
     )
 
+    senior_official = models.ForeignKey(
+        "registrar.SeniorOfficial",
+        on_delete=models.PROTECT,
+        help_text="Associated senior official",
+        unique=False,
+        default=FederalAgency.get_non_federal_agency,
+    )
+
     organization_type = models.CharField(
         max_length=255,
         choices=OrganizationChoices.choices,
diff --git a/src/registrar/models/senior_official.py b/src/registrar/models/senior_official.py
index deb5c0f11..001dee579 100644
--- a/src/registrar/models/senior_official.py
+++ b/src/registrar/models/senior_official.py
@@ -22,18 +22,18 @@ class SeniorOfficial(TimeStampedModel):
 
 
     first_name = models.CharField(
-        null=True,
-        blank=True,
+        null=False,
+        blank=False,
         verbose_name="first name",
     )
     last_name = models.CharField(
-        null=True,
-        blank=True,
+        null=False,
+        blank=False,
         verbose_name="last name",
     )
     title = models.CharField(
-        null=True,
-        blank=True,
+        null=False,
+        blank=False,
         verbose_name="title / role",
     )
     phone = PhoneNumberField(