diff --git a/.ruff.toml b/.ruff.toml
deleted file mode 100644
index 7eb1bc9..0000000
--- a/.ruff.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-ignore = ["E203", "E226", "E228", "E999", "N802", "N803", "N806", "N812", "N813", "N815", "N816", "N999"]
-line-length = 110
-exclude = ["__init__.py", "doc/conf.py"]
-select = ["E", "F", "N", "W"]
-[pycodestyle]
-max-doc-length = 79
-[pydocstyle]
-convention = "numpy"
diff --git a/bin.src/imgClosedLoop.py b/bin.src/img_closed_loop.py
similarity index 97%
rename from bin.src/imgClosedLoop.py
rename to bin.src/img_closed_loop.py
index 863f3be..86bbfb9 100644
--- a/bin.src/imgClosedLoop.py
+++ b/bin.src/img_closed_loop.py
@@ -24,7 +24,7 @@
 import argparse
 import logging
 
-from lsst.ts.imsim.closedLoopTask import ClosedLoopTask
+from lsst.ts.imsim.closed_loop_task import ClosedLoopTask
 
 if __name__ == "__main__":
     # Set the parser
diff --git a/doc/user-guide/user-guide.rst b/doc/user-guide/user-guide.rst
index 0a23abc..d7ab5ca 100644
--- a/doc/user-guide/user-guide.rst
+++ b/doc/user-guide/user-guide.rst
@@ -4,7 +4,7 @@
 User Guide
 #####################
 
-The `ts_imsim` closed loop is designed to run as an executable through the command line as `imgClosedLoop.py`.
+The `ts_imsim` closed loop is designed to run as an executable through the command line as `img_closed_loop.py`.
 
 .. _Installing_ts_imsim:
 
@@ -46,13 +46,13 @@ Using `ts_imsim`
 Running the AOS Closed Loop
 ---------------------------
 
-The closed loop is available from the command line after running `scons` with the command `imgClosedLoop.py`.
+The closed loop is available from the command line after running `scons` with the command `img_closed_loop.py`.
 
 A sample command to run 5 iterations of the closed loop with the lsst wavefront sensors is:
 
 .. code-block:: python
 
-    imgClosedLoop.py --output cwfs_imsim_output/ --iter_num 5 --config_pointer_file ts_imsim/policy/config/lsstCamNoPertPointer.yaml --turn_off_atmosphere --turn_off_sky_background
+    img_closed_loop.py --output cwfs_imsim_output/ --iter_num 5 --config_pointer_file ts_imsim/policy/config/lsstCamNoPertPointer.yaml --turn_off_atmosphere --turn_off_sky_background
 
 where the following minimal set of command line options are used:
 
diff --git a/doc/versionHistory.rst b/doc/versionHistory.rst
index cacc258..3c107ea 100644
--- a/doc/versionHistory.rst
+++ b/doc/versionHistory.rst
@@ -7,10 +7,12 @@ Version History
 ##################
 
 -------------
-0.6.4
+0.7.0
 -------------
 
 * Add T&S pre-commit settings to ts_imsim.
+* Change file names to snake_case.
+* Move imgClosedLoop to img_closed_loop.
 
 -------------
 0.6.3
diff --git a/python/lsst/ts/imsim/__init__.py b/python/lsst/ts/imsim/__init__.py
index e2de311..69cb82a 100644
--- a/python/lsst/ts/imsim/__init__.py
+++ b/python/lsst/ts/imsim/__init__.py
@@ -19,8 +19,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-from .closedLoopTask import *
-from .imsimCmpt import *
-from .obsMetadata import *
-from .opdMetrology import *
-from .skySim import *
+from .closed_loop_task import *
+from .imsim_cmpt import *
+from .obs_metadata import *
+from .opd_metrology import *
+from .sky_sim import *
diff --git a/python/lsst/ts/imsim/closedLoopTask.py b/python/lsst/ts/imsim/closed_loop_task.py
similarity index 99%
rename from python/lsst/ts/imsim/closedLoopTask.py
rename to python/lsst/ts/imsim/closed_loop_task.py
index cbb84da..4ef7076 100644
--- a/python/lsst/ts/imsim/closedLoopTask.py
+++ b/python/lsst/ts/imsim/closed_loop_task.py
@@ -32,10 +32,10 @@
 import numpy as np
 from lsst.afw.cameraGeom import FIELD_ANGLE, DetectorType
 from lsst.daf import butler as dafButler
-from lsst.ts.imsim.imsimCmpt import ImsimCmpt
-from lsst.ts.imsim.obsMetadata import ObsMetadata
-from lsst.ts.imsim.opdMetrology import OpdMetrology
-from lsst.ts.imsim.skySim import SkySim
+from lsst.ts.imsim.imsim_cmpt import ImsimCmpt
+from lsst.ts.imsim.obs_metadata import ObsMetadata
+from lsst.ts.imsim.opd_metrology import OpdMetrology
+from lsst.ts.imsim.sky_sim import SkySim
 from lsst.ts.imsim.utils import (
     SensorWavefrontError,
     get_camera,
diff --git a/python/lsst/ts/imsim/imsimCmpt.py b/python/lsst/ts/imsim/imsim_cmpt.py
similarity index 99%
rename from python/lsst/ts/imsim/imsimCmpt.py
rename to python/lsst/ts/imsim/imsim_cmpt.py
index 62f2c44..4a846cf 100644
--- a/python/lsst/ts/imsim/imsimCmpt.py
+++ b/python/lsst/ts/imsim/imsim_cmpt.py
@@ -28,9 +28,9 @@
 import yaml
 from astropy.io import fits
 from lsst.afw import cameraGeom
-from lsst.ts.imsim.obsMetadata import ObsMetadata
-from lsst.ts.imsim.opdMetrology import OpdMetrology
-from lsst.ts.imsim.skySim import SkySim
+from lsst.ts.imsim.obs_metadata import ObsMetadata
+from lsst.ts.imsim.opd_metrology import OpdMetrology
+from lsst.ts.imsim.sky_sim import SkySim
 from lsst.ts.imsim.utils import (
     ModifiedEnvironment,
     SensorWavefrontError,
diff --git a/python/lsst/ts/imsim/obsMetadata.py b/python/lsst/ts/imsim/obs_metadata.py
similarity index 100%
rename from python/lsst/ts/imsim/obsMetadata.py
rename to python/lsst/ts/imsim/obs_metadata.py
diff --git a/python/lsst/ts/imsim/opdMetrology.py b/python/lsst/ts/imsim/opd_metrology.py
similarity index 100%
rename from python/lsst/ts/imsim/opdMetrology.py
rename to python/lsst/ts/imsim/opd_metrology.py
diff --git a/python/lsst/ts/imsim/skySim.py b/python/lsst/ts/imsim/sky_sim.py
similarity index 99%
rename from python/lsst/ts/imsim/skySim.py
rename to python/lsst/ts/imsim/sky_sim.py
index 8e745f8..73bcc36 100644
--- a/python/lsst/ts/imsim/skySim.py
+++ b/python/lsst/ts/imsim/sky_sim.py
@@ -24,7 +24,7 @@
 import astropy
 import numpy as np
 from astroplan import Observer
-from lsst.ts.imsim.obsMetadata import ObsMetadata
+from lsst.ts.imsim.obs_metadata import ObsMetadata
 from lsst.ts.imsim.utils import get_camera
 
 
diff --git a/python/lsst/ts/imsim/utils/__init__.py b/python/lsst/ts/imsim/utils/__init__.py
index d5fe6a1..88b9815 100644
--- a/python/lsst/ts/imsim/utils/__init__.py
+++ b/python/lsst/ts/imsim/utils/__init__.py
@@ -19,7 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-from .metroTool import *
-from .plotUtil import *
-from .sensorWavefrontError import *
+from .metro_tool import *
+from .plot_util import *
+from .sensor_wavefront_error import *
 from .utility import *
diff --git a/python/lsst/ts/imsim/utils/metroTool.py b/python/lsst/ts/imsim/utils/metro_tool.py
similarity index 100%
rename from python/lsst/ts/imsim/utils/metroTool.py
rename to python/lsst/ts/imsim/utils/metro_tool.py
diff --git a/python/lsst/ts/imsim/utils/plotUtil.py b/python/lsst/ts/imsim/utils/plot_util.py
similarity index 100%
rename from python/lsst/ts/imsim/utils/plotUtil.py
rename to python/lsst/ts/imsim/utils/plot_util.py
diff --git a/python/lsst/ts/imsim/utils/sensorWavefrontError.py b/python/lsst/ts/imsim/utils/sensor_wavefront_error.py
similarity index 100%
rename from python/lsst/ts/imsim/utils/sensorWavefrontError.py
rename to python/lsst/ts/imsim/utils/sensor_wavefront_error.py
diff --git a/tests/test_closedLoopTask.py b/tests/test_closed_loop_task.py
similarity index 98%
rename from tests/test_closedLoopTask.py
rename to tests/test_closed_loop_task.py
index 400d045..e7b334f 100644
--- a/tests/test_closedLoopTask.py
+++ b/tests/test_closed_loop_task.py
@@ -24,8 +24,7 @@
 import tempfile
 import unittest
 
-from lsst.ts.imsim.closedLoopTask import ClosedLoopTask
-from lsst.ts.imsim.obsMetadata import ObsMetadata
+from lsst.ts.imsim import ClosedLoopTask, ObsMetadata
 from lsst.ts.imsim.utils.utility import get_module_path
 from lsst.ts.wep.utils import CamType, FilterType
 
diff --git a/tests/test_imsimCmpt.py b/tests/test_imsim_cmpt.py
similarity index 98%
rename from tests/test_imsimCmpt.py
rename to tests/test_imsim_cmpt.py
index 319143e..dfbea0d 100644
--- a/tests/test_imsimCmpt.py
+++ b/tests/test_imsim_cmpt.py
@@ -26,11 +26,9 @@
 import galsim
 import numpy as np
 import yaml
-from lsst.ts.imsim.imsimCmpt import ImsimCmpt
-from lsst.ts.imsim.obsMetadata import ObsMetadata
-from lsst.ts.imsim.skySim import SkySim
-from lsst.ts.imsim.utils.sensorWavefrontError import SensorWavefrontError
-from lsst.ts.imsim.utils.utility import (
+from lsst.ts.imsim import ImsimCmpt, ObsMetadata, SkySim
+from lsst.ts.imsim.utils import (
+    SensorWavefrontError,
     get_camera,
     get_config_dir,
     get_module_path,
diff --git a/tests/test_obsMetadata.py b/tests/test_obs_metadata.py
similarity index 97%
rename from tests/test_obsMetadata.py
rename to tests/test_obs_metadata.py
index 36c537c..0efe11d 100644
--- a/tests/test_obsMetadata.py
+++ b/tests/test_obs_metadata.py
@@ -21,7 +21,7 @@
 
 import unittest
 
-from lsst.ts.imsim.obsMetadata import ObsMetadata
+from lsst.ts.imsim import ObsMetadata
 
 
 class TestObsMetadata(unittest.TestCase):
diff --git a/tests/test_opdMetrology.py b/tests/test_opd_metrology.py
similarity index 99%
rename from tests/test_opdMetrology.py
rename to tests/test_opd_metrology.py
index 5eb96f7..3bd6ffa 100644
--- a/tests/test_opdMetrology.py
+++ b/tests/test_opd_metrology.py
@@ -26,7 +26,7 @@
 import numpy as np
 from astropy.io import fits
 from lsst.afw.cameraGeom import FIELD_ANGLE
-from lsst.ts.imsim.opdMetrology import OpdMetrology
+from lsst.ts.imsim import OpdMetrology
 from lsst.ts.imsim.utils.utility import get_module_path, get_zk_from_file
 
 
diff --git a/tests/test_skySim.py b/tests/test_sky_sim.py
similarity index 97%
rename from tests/test_skySim.py
rename to tests/test_sky_sim.py
index cc12e3d..fa6b4f4 100644
--- a/tests/test_skySim.py
+++ b/tests/test_sky_sim.py
@@ -24,8 +24,7 @@
 
 from astroplan import FixedTarget, Observer
 from astropy.time import Time
-from lsst.ts.imsim.obsMetadata import ObsMetadata
-from lsst.ts.imsim.skySim import SkySim
+from lsst.ts.imsim import ObsMetadata, SkySim
 from lsst.ts.imsim.utils.utility import get_module_path
 
 
diff --git a/tests/utils/test_plotUtil.py b/tests/utils/test_plot_util.py
similarity index 94%
rename from tests/utils/test_plotUtil.py
rename to tests/utils/test_plot_util.py
index 9b1653a..28bbe06 100644
--- a/tests/utils/test_plotUtil.py
+++ b/tests/utils/test_plot_util.py
@@ -22,8 +22,7 @@
 import os
 import unittest
 
-from lsst.ts.imsim.utils.plotUtil import plot_fwhm_of_iters
-from lsst.ts.imsim.utils.utility import get_module_path
+from lsst.ts.imsim.utils import get_module_path, plot_fwhm_of_iters
 
 
 class TestPlotUtil(unittest.TestCase):
diff --git a/tests/utils/test_sensorWavefrontError.py b/tests/utils/test_sensor_wavefront_error.py
similarity index 98%
rename from tests/utils/test_sensorWavefrontError.py
rename to tests/utils/test_sensor_wavefront_error.py
index aadcdd7..b713c14 100644
--- a/tests/utils/test_sensorWavefrontError.py
+++ b/tests/utils/test_sensor_wavefront_error.py
@@ -22,7 +22,7 @@
 import unittest
 
 import numpy as np
-from lsst.ts.imsim.utils.sensorWavefrontError import SensorWavefrontError
+from lsst.ts.imsim.utils import SensorWavefrontError
 
 
 class TestSensorWavefrontError(unittest.TestCase):
diff --git a/tests/utils/test_utility.py b/tests/utils/test_utility.py
index 03fd19a..fb8c33c 100644
--- a/tests/utils/test_utility.py
+++ b/tests/utils/test_utility.py
@@ -24,7 +24,7 @@
 
 from lsst.afw import cameraGeom
 from lsst.obs.lsst import LsstCam
-from lsst.ts.imsim.utils.utility import (
+from lsst.ts.imsim.utils import (
     ModifiedEnvironment,
     get_camera,
     get_config_dir,