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Casey Siemaszko (born Kazimierz A. Siemaszko) is a Polish-American actor and the brother of actress Nina Siemaszko. The son of a fighter in the Polish Underground who survived the Sachsenhausen concentration camp, Siemaszko narrated the 1998 feature, The Polish-Americans. Siemaszko was a graduate of the Goodman School of Drama at DePaul University in Chicago, which his sister, Nina Siemaszko later also attended. His acting career consists of smaller roles in dozen of popular films, including Back to the Future, Young Guns, Silence of the Heart, Of Mice and Men, Killing Kennedy, Back to the Future Part II and Stand By Me.

Billions
as Seids

Killing Kennedy
as Jack Ruby

The Blacklist
as Sam Raimo

Elementary
as Michael McGee

NYC 22
as Blume

Person of Interest
as Lester Strickland

Unforgettable
as Lt. Greg Sartain

Blue Bloods
as Josh Thorp

White Collar
as Bertie Slavkin

Public Enemies
as Harry Berman

New Amsterdam
as Peter Huygens

Damages
as Detective Dan Williams

The Boy Who Cried Bitch: The Adolescent Years

The Inside
as Billy Ray Pope

Grand Theft Auto: San Andreas - The Introduction
as Johnny Sindacco (voice) (uncredited)

CSI: NY
as Paul Sabotini
The Street Lawyer
as Rafter Mayes

Law & Order: Criminal Intent
as Harvey Gruenwald

The Crew
as Young Bobby Bartellemeo

Law & Order: Special Victims Unit
as EPA Official

Limbo
as Bobby Gastineau

Storm of the Century
as Alton "Hatch" Hatcher

Chameleon II: Death Match
as Jake Booker

Together and Alone
as Billy

Oz
as Detective Tarnowski

Rose Hill
as Fergus Carroll

Bliss
as Tanner

Chicago Sons

Mistrial
as Detective Bobby Zito

The Phantom
as Morgan

Black Scorpion
as Dr. Goddard / The Breath Taker

Napoleon
as Conan (voice)

Milk Money
as Cash

My Life's in Turnaround
as Himself

704 Hauser

Teresa's Tattoo
as Michael

The Paint Job
as Cal

The Adventures of Brisco County, Jr.
as Ned Zed

Of Mice and Men
as Curley

Near Mrs.
as Colin Phipps

The Big Slice
as Mike Sawyer

The Chase
as Hutchinson

Law & Order
as Bart Rainey

Back to the Future Part II
as 3-D

Breaking In
as Mike Lafebb

Young Guns
as Charley Bowdre

Biloxi Blues
as Don Carney

Three O'Clock High
as Jerry Mitchell

Gardens of Stone
as Wildman

American Harvest
as Dakota

Stand by Me
as Billy Tessio

Amazing Stories
as Jonathan

Miracle of the Heart: A Boys Town Story
as Andy Grainger

Amazing Stories
as Jonathan

Back to the Future
as 3-D

Secret Admirer
as Roger Despard

Silence of the Heart
as Jeff

Hard Knox
as Aaron Davis

Class
as Doug

St. Elsewhere
as Rick Messina