David Alan Hornsby (born December 1, 1975) is an American actor, screenwriter, and producer. He is best known for a recurring role as defrocked priest Matthew "Rickety Cricket" Mara on the FX comedy series It's Always Sunny in Philadelphia, for which he also writes and co-produces. Hornsby also had a regular role on the NBC comedy-crime series Good Girls (2018–2020). He is also the voice of Fanboy in the Nickelodeon animated TV series Fanboy & Chum Chum.

KNOWN FOR

Bones
2013
The West Wing
2006
It's Always Sunny in Philadelphia
2006
ER
1999
The Goldbergs
2017
New Girl
2016
We Bare Bears
2018
Six Feet Under
2003
The Unit
2006
Good Girls
2018
Mythic Quest
2020
St. Denis Medical
2025

FILMOGRAPHY

All
Movies
TV
Acting
41
Directing
1
Writing
4
Producing
6
2026
The Hawk
as Radford
2025
St. Denis Medical
as Harry
2023
Fool's Paradise
as Pilot
2023
Merry Little Batman
as The Joker / Fireman (voice)
2022
Battle Kitty
as Mole Monster (voice)
2020
Mythic Quest
as David Brittlesbee
2018
We Bare Bears
as Harry / Additional Voices (voice)
2018
Good Girls
as Leslie 'Boomer' Peterson
2017
The Goldbergs
as Kyle Schnitz
2016
New Girl
as Ed Warner
2016
Baskets
as Pastor
2014
Earmouse and Bottle
as Earmouse
2014
The Goldbergs
as Kyle
2013
Hello Ladies
as Andy
2013
Bones
as Father Harrow
2012
Unsupervised
as Joel Zymanski (voice)
2011
How to Be a Gentleman
as Andrew Carlson
2009
Fanboy and Chum Chum
as Fanboy (voice)
2009
Random! Cartoons
as Fanboy / Kid #2 (voice)
2009
Fanboy and Chum Chum
as Fanbot (voice)
2008
Pretty Bird
as Kenny Owenby
2008
Fanboy
as Fanboy (voice) / Kid #2 (voice)
2008
Boldly Going Nowhere
2008
Dirt
as Harold Beckman
2007
Aliens vs Predator: Requiem
as Drew
2006
Flags of Our Fathers
as Louis Lowery
2006
It's Always Sunny in Philadelphia
as Matthew 'Rickety Cricket' Mara
2006
The West Wing
as Fred
2006
The Unit
as Ricky
2005
Jake in Progress
as Ken
2004
Christmas with the Kranks
as Randy Becker
2004
Straight Eye: The Movie
as Daryl
2004
Center of the Universe
as Victor
2003
The Joe Schmo Show
as Steve
2003
The Mullets
as Denny Mullet
2003
Six Feet Under
as Patrick
2002
Minority Report
as Pre-Crime Public Service Announcer
2001
Born Loser
as Warren
2001
Pearl Harbor
as Flyer with Murmur
1999
ER
as Strauss
Boldly Going Nowhere
as Lt. Lance Brigsby