diff --git a/.coveragerc b/.coveragerc
index ce75f60..c6430d3 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -3,9 +3,9 @@ branch = True
 
 [report]
 omit =
-    google/cloud/_testing.py
     google/cloud/__init__.py
-    google/cloud/environment_vars.py
+    google/cloud/_testing/__init__.py
+    google/cloud/environment_vars/__init__.py
 fail_under = 100
 show_missing = True
 exclude_lines =
diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index ee94722..108063d 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:6e7328583be8edd3ba8f35311c76a1ecbc823010279ccb6ab46b7a76e25eafcc
+  digest: sha256:4ee57a76a176ede9087c14330c625a71553cf9c72828b2c0ca12f5338171ba60
diff --git a/.kokoro/docs/common.cfg b/.kokoro/docs/common.cfg
index 10be942..ff5ab7e 100644
--- a/.kokoro/docs/common.cfg
+++ b/.kokoro/docs/common.cfg
@@ -30,6 +30,7 @@ env_vars: {
 
 env_vars: {
     key: "V2_STAGING_BUCKET"
+    # Push google cloud library docs to the Cloud RAD bucket `docs-staging-v2`
     value: "docs-staging-v2"
 }
 
diff --git a/.kokoro/samples/python3.10/common.cfg b/.kokoro/samples/python3.10/common.cfg
new file mode 100644
index 0000000..0bce697
--- /dev/null
+++ b/.kokoro/samples/python3.10/common.cfg
@@ -0,0 +1,40 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Specify which tests to run
+env_vars: {
+    key: "RUN_TESTS_SESSION"
+    value: "py-3.10"
+}
+
+# Declare build specific Cloud project.
+env_vars: {
+    key: "BUILD_SPECIFIC_GCLOUD_PROJECT"
+    value: "python-docs-samples-tests-310"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-cloud-core/.kokoro/test-samples.sh"
+}
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/python-samples-testing-docker"
+}
+
+# Download secrets for samples
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "python-cloud-core/.kokoro/trampoline_v2.sh"
\ No newline at end of file
diff --git a/.kokoro/samples/python3.10/continuous.cfg b/.kokoro/samples/python3.10/continuous.cfg
new file mode 100644
index 0000000..a1c8d97
--- /dev/null
+++ b/.kokoro/samples/python3.10/continuous.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
\ No newline at end of file
diff --git a/.kokoro/samples/python3.10/periodic-head.cfg b/.kokoro/samples/python3.10/periodic-head.cfg
new file mode 100644
index 0000000..f9e9e94
--- /dev/null
+++ b/.kokoro/samples/python3.10/periodic-head.cfg
@@ -0,0 +1,11 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-cloud-core/.kokoro/test-samples-against-head.sh"
+}
diff --git a/.kokoro/samples/python3.10/periodic.cfg b/.kokoro/samples/python3.10/periodic.cfg
new file mode 100644
index 0000000..71cd1e5
--- /dev/null
+++ b/.kokoro/samples/python3.10/periodic.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "False"
+}
diff --git a/.kokoro/samples/python3.10/presubmit.cfg b/.kokoro/samples/python3.10/presubmit.cfg
new file mode 100644
index 0000000..a1c8d97
--- /dev/null
+++ b/.kokoro/samples/python3.10/presubmit.cfg
@@ -0,0 +1,6 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bd179a..01e2c7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@
 
 [1]: https://pypi.org/project/google-cloud-core/#history
 
+## [2.2.0](https://www.github.com/googleapis/python-cloud-core/compare/v2.1.0...v2.2.0) (2021-11-09)
+
+
+### Features
+
+* add mypy checking + 'py.typed' files ([#149](https://www.github.com/googleapis/python-cloud-core/issues/149)) ([f20ef60](https://www.github.com/googleapis/python-cloud-core/commit/f20ef60abaff13520d2e7b9719741746bd0d1c7b))
 ## [2.1.0](https://www.github.com/googleapis/python-cloud-core/compare/v2.0.0...v2.1.0) (2021-10-05)
 
 
diff --git a/google/__init__.py b/google/__init__.py
index 0d0a4c3..70a7bd9 100644
--- a/google/__init__.py
+++ b/google/__init__.py
@@ -21,4 +21,4 @@
 except ImportError:
     import pkgutil
 
-    __path__ = pkgutil.extend_path(__path__, __name__)
+    __path__ = pkgutil.extend_path(__path__, __name__)  # type: ignore
diff --git a/google/cloud/__init__.py b/google/cloud/__init__.py
index f281ec0..ef78099 100644
--- a/google/cloud/__init__.py
+++ b/google/cloud/__init__.py
@@ -21,4 +21,4 @@
 except ImportError:
     import pkgutil
 
-    __path__ = pkgutil.extend_path(__path__, __name__)
+    __path__ = pkgutil.extend_path(__path__, __name__)  # type: ignore
diff --git a/google/cloud/_helpers.py b/google/cloud/_helpers/__init__.py
similarity index 99%
rename from google/cloud/_helpers.py
rename to google/cloud/_helpers/__init__.py
index d8f2851..291f587 100644
--- a/google/cloud/_helpers.py
+++ b/google/cloud/_helpers/__init__.py
@@ -25,6 +25,7 @@
 import os
 import re
 from threading import local as Local
+from typing import Union
 
 import google.auth
 import google.auth.transport.requests
@@ -62,6 +63,7 @@
 )
 # NOTE: Catching this ImportError is a workaround for GAE not supporting the
 #       "pwd" module which is imported lazily when "expanduser" is called.
+_USER_ROOT: Union[str, None]
 try:
     _USER_ROOT = os.path.expanduser("~")
 except ImportError:  # pragma: NO COVER
diff --git a/google/cloud/_helpers/py.typed b/google/cloud/_helpers/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/_helpers/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/_http.py b/google/cloud/_http/__init__.py
similarity index 100%
rename from google/cloud/_http.py
rename to google/cloud/_http/__init__.py
diff --git a/google/cloud/_http/py.typed b/google/cloud/_http/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/_http/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/_testing.py b/google/cloud/_testing/__init__.py
similarity index 100%
rename from google/cloud/_testing.py
rename to google/cloud/_testing/__init__.py
diff --git a/google/cloud/_testing/py.typed b/google/cloud/_testing/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/_testing/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/client.py b/google/cloud/client/__init__.py
similarity index 99%
rename from google/cloud/client.py
rename to google/cloud/client/__init__.py
index e058c2d..b3ca4b8 100644
--- a/google/cloud/client.py
+++ b/google/cloud/client/__init__.py
@@ -18,6 +18,8 @@
 import json
 import os
 from pickle import PicklingError
+from typing import Tuple
+from typing import Union
 
 import google.api_core.client_options
 import google.api_core.exceptions
@@ -142,7 +144,7 @@ class Client(_ClientFactoryMixin):
             to acquire default credentials.
     """
 
-    SCOPE = None
+    SCOPE: Union[Tuple[str], None] = None
     """The scopes required for authenticating with a service.
 
     Needs to be set by subclasses.
diff --git a/google/cloud/client/py.typed b/google/cloud/client/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/client/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/environment_vars.py b/google/cloud/environment_vars/__init__.py
similarity index 100%
rename from google/cloud/environment_vars.py
rename to google/cloud/environment_vars/__init__.py
diff --git a/google/cloud/environment_vars/py.typed b/google/cloud/environment_vars/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/environment_vars/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/exceptions.py b/google/cloud/exceptions/__init__.py
similarity index 100%
rename from google/cloud/exceptions.py
rename to google/cloud/exceptions/__init__.py
diff --git a/google/cloud/exceptions/py.typed b/google/cloud/exceptions/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/exceptions/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/obsolete.py b/google/cloud/obsolete/__init__.py
similarity index 100%
rename from google/cloud/obsolete.py
rename to google/cloud/obsolete/__init__.py
diff --git a/google/cloud/obsolete/py.typed b/google/cloud/obsolete/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/obsolete/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/operation.py b/google/cloud/operation/__init__.py
similarity index 99%
rename from google/cloud/operation.py
rename to google/cloud/operation/__init__.py
index 28ac8cf..4fd1f27 100644
--- a/google/cloud/operation.py
+++ b/google/cloud/operation/__init__.py
@@ -14,13 +14,15 @@
 
 """Wrap long-running operations returned from Google Cloud APIs."""
 
+from typing import Dict
+
 from google.longrunning import operations_pb2
 from google.protobuf import json_format
 
 
 _GOOGLE_APIS_PREFIX = "type.googleapis.com"
 
-_TYPE_URL_MAP = {}
+_TYPE_URL_MAP: Dict[str, type] = {}
 
 
 def _compute_type_url(klass, prefix=_GOOGLE_APIS_PREFIX):
diff --git a/google/cloud/operation/py.typed b/google/cloud/operation/py.typed
new file mode 100644
index 0000000..dfc5374
--- /dev/null
+++ b/google/cloud/operation/py.typed
@@ -0,0 +1,2 @@
+# Marker file for PEP 561.
+# This package uses inline types.
diff --git a/google/cloud/version.py b/google/cloud/version.py
index 8b5d332..bd0f8e5 100644
--- a/google/cloud/version.py
+++ b/google/cloud/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2.1.0"
+__version__ = "2.2.0"
diff --git a/mypy.ini b/mypy.ini
new file mode 100644
index 0000000..5663b40
--- /dev/null
+++ b/mypy.ini
@@ -0,0 +1,7 @@
+[mypy]
+python_version = 3.6
+namespace_packages = True
+ignore_missing_imports = True
+
+[mypy-google.protobuf]
+ignore_missing_imports = True
diff --git a/noxfile.py b/noxfile.py
index c29d0f3..8fc781f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -38,6 +38,16 @@ def lint(session):
     session.run("flake8", "google", "tests")
 
 
+@nox.session(python=DEFAULT_PYTHON_VERSION)
+def mypy(session):
+    """Run type-checking."""
+    session.install(".", "mypy")
+    session.install(
+        "types-setuptools", "types-requests", "types-mock", "types-protobuf",
+    )
+    session.run("mypy", "google", "tests")
+
+
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def blacken(session):
     """Run black.