William Stanford Davis

William Stanford Davis (born August 7, 1951) is an American actor. He is best known for his role as school custodian Mr. Johnson on the ABC sitcom Abbott Elementary (2021–present).

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Known For

CSI: Crime Scene Investigation

2000 • as Mechanic

Shameless

2011 • as Conrad

Bones

2005 • as Floyd Barber

It's Always Sunny in Philadelphia

2005 • as Mr. Johnson

The Kelly Clarkson Show

2019 • as Self

Desperate Housewives

2004 • as William

Filmography

2026

Undercard

as Baba T

Movie - Released: 2/27/2026

2025

Diary of a Wimpy Kid: The Last Straw

as Troopmaster Barrett (voice)

Movie - Released: 12/4/2025

Side Quest

as Earl

TV - Released: 3/25/2025

2022

The Jennifer Hudson Show

as Self - Guest

TV - Released: 9/12/2022

Sherri

as Self - Guest

TV - Released: 9/12/2022

2021

A Holiday Chance

as Bernie

Movie - Released: 11/24/2021

Abbott Elementary

as Mr. Johnson

TV - Released: 12/7/2021

Swagger

as Coach Max

TV - Released: 10/29/2021

2020

Snowpiercer

as Mr. Riggs

TV - Released: 5/17/2020

Perry Mason

as Daniel Madison

TV - Released: 6/21/2020

2019

Adopt a Highway

as Hatty

Movie - Released: 11/1/2019

Truth Be Told

as Agathia

TV - Released: 12/6/2019

The Kelly Clarkson Show

as Self

TV - Released: 9/9/2019

2018

Holly Day

as Thaddeus

Movie - Released: 12/22/2018

Please Stand By

as Creed (uncredited)

Movie - Released: 1/26/2018

Dead Women Walking

as Warden

Movie - Released: 4/20/2018

Light as a Feather

as Old Man

TV - Released: 10/12/2018

2017

Handsome: A Netflix Mystery Movie

as Lester

Movie - Released: 5/5/2017

2016

Movie

You Can Never Really Know Someone

as Man 2 (Bible Study Member)

Movie - Released: 4/13/2016

A Winter Rose

as Stage Manager

Movie - Released: 12/2/2016

Cardboard Boxer

as Jazzy

Movie - Released: 9/16/2016

So B. It

as Man at Cab Co.

Movie - Released: 6/7/2016

2015

When Duty Calls

as Clyde Pierce

Movie - Released: 12/30/2015

Guns for Hire

as Liquor Store Clerk

Movie - Released: 10/20/2015

Chicago Med

as Ed Brennan

TV - Released: 11/17/2015

2013

L.A. Superheroes

as Hal

Movie - Released: 11/8/2013

Ray Donovan

as Potato Pie

TV - Released: 6/30/2013

2012

Love, Gloria

as Kenny

Movie - Released: 6/7/2012

The Finder

as Earl

TV - Released: 1/12/2012

2011

Shameless

as Conrad

TV - Released: 1/9/2011

Harry's Law

as Kareem Anderson

TV - Released: 1/17/2011

2010

Barry Munday

as Greens Keeper

Movie - Released: 3/13/2010

2009

Across the Hall

as Custodian

Movie - Released: 8/27/2009

Accused at 17

as Detective Gilson

Movie - Released: 12/5/2009

The Middle

as Projectionist

TV - Released: 9/30/2009

2008

Terminator: The Sarah Connor Chronicles

as Pastor Jonas

TV - Released: 1/13/2008

2007

Hallowed Ground

as Truck Driver

Movie - Released: 10/9/2007

The Big Bang Theory

as Dry Cleaner

TV - Released: 9/24/2007

Saving Grace

as Group member at party

TV - Released: 7/23/2007

2006

Sons & Daughters

as Cook

TV - Released: 3/7/2006

Studio 60 on the Sunset Strip

as Floor Manager

TV - Released: 9/18/2006

Shark

as Sonny Gore

TV - Released: 9/21/2006

2005

Self Medicated

as Gabe

Movie - Released: 6/1/2005

Urban Evil: Trilogy of Fear

Movie - Released: 2/8/2005

A Lot Like Love

as Priest

Movie - Released: 4/21/2005

My Name Is Earl

as Neighbor

TV - Released: 9/20/2005

Bones

as Floyd Barber

TV - Released: 9/13/2005

The Closer

as Homeless Man

TV - Released: 6/13/2005

It's Always Sunny in Philadelphia

as Mr. Johnson

TV - Released: 8/4/2005

2004

Clean

as Foster

Movie - Released: 1/1/2004

The Spirit Hunter

as Gabe

Movie - Released: 5/13/2004

Movie

Subway Cafe

as Jerome Mayfield

Movie - Released: 1/31/2004

Desperate Housewives

as William

TV - Released: 10/3/2004

LAX

as Engineer Dietrich

TV - Released: 9/13/2004

2003

Cold Case

as Deante

TV - Released: 9/28/2003

Jimmy Kimmel Live!

as Self - Guest

TV - Released: 1/26/2003

2002

Movie

Bulldog

as Leon

Movie - Released: 7/12/2002

The Shield

as Deon

TV - Released: 3/12/2002

American Dreams

as Joe

TV - Released: 9/29/2002

2001

Movie

The Red Boot Diaries

as Leon

Movie - Released: 1/1/2001

James Dean

as Train Conductor

Movie - Released: 8/4/2001

The Guardian

as Brian

TV - Released: 9/25/2001

2000

The Prophecy 3: The Ascent

as Portly Coroner

Movie - Released: 3/14/2000

CSI: Crime Scene Investigation

as Mechanic

TV - Released: 10/6/2000

The District

as Mr. Gillis

TV - Released: 10/7/2000

Strong Medicine

as Doug - Aneesha's Boss

TV - Released: 7/23/2000

Curb Your Enthusiasm

as Chulu Porter

TV - Released: 10/15/2000

1999

Ragdoll

as Big Pere

Movie - Released: 12/21/1999

Angel

as Security Guard

TV - Released: 10/5/1999

1998

Primary Colors

as Jack Mandela Washington

Movie - Released: 3/20/1998

City of Angels

as Construction Foreman

Movie - Released: 4/10/1998

1997

Running Time

as Buzz

Movie - Released: 12/18/1997

Ally McBeal

as Jim

TV - Released: 9/8/1997

The Practice

as Clarence Barnett

TV - Released: 3/4/1997

1994

Touched by an Angel

as Doug

TV - Released: 9/21/1994

Sister, Sister

as Rev. Tatum

TV - Released: 4/1/1994

Unknown

Movie

Damn Whitey

as George

Movie