diff --git a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/metaExtension.pure b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/metaExtension.pure
index 8d124709cca..345a7f8f374 100644
--- a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/metaExtension.pure
+++ b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/metaExtension.pure
@@ -137,7 +137,7 @@ function {doc.doc = 'Recursively get all explicitly defined generalizations.'}
     meta::pure::functions::meta::hierarchicalAllGeneralizations(type : Type[1]) : Class<Any>[*]
 {
   let oneLevel = $type->validGeneralizations();
-  $oneLevel->concatenate($oneLevel->map(c | $c->validGeneralizations()))->removeDuplicates();
+  $oneLevel->concatenate($oneLevel->map(c | $c->hierarchicalAllGeneralizations()))->removeDuplicates();
 }
 
 function {doc.doc = 'Get all inherited properties on the provided class'}
diff --git a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtension.pure b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtension.pure
index 61856509c72..cdaa1245c65 100644
--- a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtension.pure
+++ b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtension.pure
@@ -355,3 +355,9 @@ function <<test.Test>> meta::pure::functions::meta::tests::testTypeNameAndPath()
   assertEquals( meta::pure::functions::tests::model::GeographicEntityType.CITY->typePath(),'meta::pure::functions::tests::model::GeographicEntityType');
 
 }
+
+function <<test.Test>> meta::pure::functions::meta::tests::testAllGeneralizations(): Boolean[1]
+{
+  assertEquals(['Parent'], meta::pure::functions::meta::validGeneralizations(meta::pure::functions::meta::tests::packageA::Child)->map(t | $t.name));
+  assertEquals(['Parent', 'GrandParent', 'GreatGrandParent'], meta::pure::functions::meta::hierarchicalAllGeneralizations(meta::pure::functions::meta::tests::packageA::Child)->map(t | $t.name));
+}
\ No newline at end of file
diff --git a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtention_funcs.pure b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtention_funcs.pure
index 0e42b3068ee..792f83c6cca 100644
--- a/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtention_funcs.pure
+++ b/legend-engine-core/legend-engine-core-pure/legend-engine-pure-code-compiled-core/src/main/resources/core/pure/corefunctions/tests/metaExtention_funcs.pure
@@ -28,6 +28,26 @@ Class meta::pure::functions::meta::tests::packageA::ClassB
    
 }
 
+Class meta::pure::functions::meta::tests::packageA::Child extends meta::pure::functions::meta::tests::packageA::Parent
+{
+   
+}
+
+Class meta::pure::functions::meta::tests::packageA::Parent extends meta::pure::functions::meta::tests::packageA::GrandParent
+{
+   
+}
+
+Class meta::pure::functions::meta::tests::packageA::GrandParent extends meta::pure::functions::meta::tests::packageA::GreatGrandParent
+{
+   
+}
+
+Class meta::pure::functions::meta::tests::packageA::GreatGrandParent 
+{
+   
+}
+
 function <<access.private>> meta::pure::functions::meta::tests::packageA::myFunc():Boolean[1]
 {
    true
diff --git a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/fromPure_sdl.pure b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/fromPure_sdl.pure
index ff20e9fb6e8..d938f590a0a 100644
--- a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/fromPure_sdl.pure
+++ b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/fromPure_sdl.pure
@@ -98,7 +98,7 @@ function meta::external::query::graphQL::binding::fromPure::sdl::transformPureTo
       ->distinct()
       ->filter(t | $t->instanceOf(Class));
 
-  let extendedClasses = $allTypes->map(t | $t->validGeneralizations());
+  let extendedClasses = $allTypes->map(t | $t->validGeneralizations())->removeDuplicates();
 
   // Build types
   let graphQLTypes = $allTypes->map(c |
@@ -301,11 +301,12 @@ function <<access.private>> meta::external::query::graphQL::binding::fromPure::s
   let nonBuiltInScalars = $props->buildNonBuiltInGraphQLScalars($pureTypeToGraphQLScalarOverride);
   let isQueryClass = $c->hasGraphQLStereotype('Query');
   let temporalStereotypes = $c->getTemporalStereotypes();
+  let extended = if($isExtended, | [$c.name], | []);
   $nonBuiltInScalars
     ->concatenate(
       ^ObjectTypeDefinition(
         name = $c.name->toOne(),
-        implements = if($isExtended, | $c.name, | $c->validGeneralizations()->map(g | $g.name))->map(n | $n->toInterfaceTypeName()),
+        implements = $extended->concatenate($c->hierarchicalAllGeneralizations()->map(g | $g.name))->map(n | $n->toInterfaceTypeName()),
         directives = $temporalStereotypes->map(s | temporalityToDirectives()->get($s)->toOne())->map(def | ^Directive(name = $def.name))->concatenate(buildHierarchyDirective($c, false)),
         fields = $props
                     ->map(p |
@@ -351,7 +352,7 @@ function <<access.private>> meta::external::query::graphQL::binding::fromPure::s
   let temporalStereotypes = $c->getTemporalStereotypes();
   ^InterfaceTypeDefinition(
     name = $c.name->toOne()->toInterfaceTypeName(),
-    implements = $c->validGeneralizations()->map(g | $g.name)->map(n | $n->toInterfaceTypeName()),
+    implements = $c->hierarchicalAllGeneralizations()->map(g | $g.name)->map(n | $n->toInterfaceTypeName()),
     directives = $temporalStereotypes->map(s | temporalityToDirectives()->get($s)->toOne())->map(def | ^Directive(name = $def.name))->concatenate(buildHierarchyDirective($c, false)),
     fields = $props
                 ->map(p |
diff --git a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/tests/simpleTest.pure b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/tests/simpleTest.pure
index 8cd0f84a6df..edc27b128bb 100644
--- a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/tests/simpleTest.pure
+++ b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/fromPure/sdl/tests/simpleTest.pure
@@ -21,6 +21,18 @@ Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Pers
   age : Integer[1];
 }
 
+Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::NonEmployee extends meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Person
+{
+}
+
+Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::SelfEmployed extends meta::external::query::graphQL::binding::fromPure::sdl::tests::model::NonEmployee
+{
+}
+
+Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Contractor extends meta::external::query::graphQL::binding::fromPure::sdl::tests::model::SelfEmployed
+{
+}
+
 Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Employee extends meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Person
 {
   title: String[1];
@@ -32,6 +44,11 @@ Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::GSEm
   division: String[1];
 }
 
+Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::NonGSEmployee extends meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Employee
+{
+  company: String[1];
+}
+
 Class meta::external::query::graphQL::binding::fromPure::sdl::tests::model::Team
 {
   name: String[1];
@@ -473,7 +490,7 @@ function <<test.Test>> meta::external::query::graphQL::binding::fromPure::sdl::t
   let res = typesToGraphQLString([GSEmployee, Employee, Person]);
 
   assertEquals(
-    'type Employee implements EmployeeInterface @extends(class: "Person") {\n' +
+    'type Employee implements EmployeeInterface & PersonInterface @extends(class: "Person") {\n' +
     '  title: String!\n' +
     '  startDate: StrictDate!\n' +
     '  firstName: String\n' +
@@ -502,7 +519,7 @@ function <<test.Test>> meta::external::query::graphQL::binding::fromPure::sdl::t
     '  _exists: Employee_bool_exp\n' +
     '}\n' +
     '\n' +
-    'type GSEmployee implements EmployeeInterface @extends(class: "Employee") {\n' +
+    'type GSEmployee implements EmployeeInterface & PersonInterface @extends(class: "Employee") {\n' +
     '  division: String!\n' +
     '  title: String!\n' +
     '  startDate: StrictDate!\n' +
@@ -555,6 +572,93 @@ function <<test.Test>> meta::external::query::graphQL::binding::fromPure::sdl::t
     $res);
 }
 
+function <<test.Test>> meta::external::query::graphQL::binding::fromPure::sdl::tests::testClassWithDeepMultipleInheritance():Boolean[1]
+{
+  let res = typesToGraphQLStringWithoutDynamicFilter([GSEmployee, NonGSEmployee, Employee, Person, NonEmployee, SelfEmployed, Contractor]);
+
+  assertEquals(
+    'type Contractor implements SelfEmployedInterface & NonEmployeeInterface & PersonInterface @extends(class: "SelfEmployed") {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type Employee implements EmployeeInterface & PersonInterface @extends(class: "Person") {\n' +
+    '  title: String!\n' +
+    '  startDate: StrictDate!\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'interface EmployeeInterface implements PersonInterface {\n' +
+    '  title: String!\n' +
+    '  startDate: StrictDate!\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type GSEmployee implements EmployeeInterface & PersonInterface @extends(class: "Employee") {\n' +
+    '  division: String!\n' +
+    '  title: String!\n' +
+    '  startDate: StrictDate!\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type NonEmployee implements NonEmployeeInterface & PersonInterface @extends(class: "Person") {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'interface NonEmployeeInterface implements PersonInterface {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type NonGSEmployee implements EmployeeInterface & PersonInterface @extends(class: "Employee") {\n' +
+    '  company: String!\n' +
+    '  title: String!\n' +
+    '  startDate: StrictDate!\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type Person implements PersonInterface {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'interface PersonInterface {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'type SelfEmployed implements SelfEmployedInterface & NonEmployeeInterface & PersonInterface @extends(class: "NonEmployee") {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'interface SelfEmployedInterface implements NonEmployeeInterface & PersonInterface {\n' +
+    '  firstName: String\n' +
+    '  lastName: String!\n' +
+    '  age: Int!\n' +
+    '}\n' +
+    '\n' +
+    'scalar StrictDate\n' +
+    '\n' +
+    'directive @extends(class: String!) on OBJECT | INPUT_OBJECT',
+    $res);
+}
+
 function <<test.Test>> meta::external::query::graphQL::binding::fromPure::sdl::tests::testPropertyWithInheritance():Boolean[1]
 {
   let res = typesToGraphQLString([Team, Employee, Person]);
diff --git a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/toPure/sdl/tests/simpleTest.pure b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/toPure/sdl/tests/simpleTest.pure
index ec1033874a3..a42cab86264 100644
--- a/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/toPure/sdl/tests/simpleTest.pure
+++ b/legend-engine-xts-graphQL/legend-engine-xt-graphQL-pure/src/main/resources/core_external_query_graphql/binding/toPure/sdl/tests/simpleTest.pure
@@ -382,7 +382,7 @@ function <<test.Test>> meta::external::query::graphQL::binding::toPure::sdl::tes
   let pureTypes = 
     graphQLToPure(
       '#GQL{' + 
-      'type Employee implements EmployeeInterface @extends(class: "Person") {\n' +
+      'type Employee implements EmployeeInterface & PersonInterface @extends(class: "Person") {\n' +
       '  title: String!\n' +
       '  startDate: StrictDate!\n' +
       '  firstName: String\n' +
@@ -398,7 +398,7 @@ function <<test.Test>> meta::external::query::graphQL::binding::toPure::sdl::tes
       '  age: Int!\n' +
       '}\n' +
       '\n' +
-      'type GSEmployee implements EmployeeInterface @extends(class: "Employee") {\n' +
+      'type GSEmployee implements EmployeeInterface & PersonInterface @extends(class: "Employee") {\n' +
       '  division: String!\n' +
       '  title: String!\n' +
       '  startDate: StrictDate!\n' +