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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.
Casey Siemaszko is a Polish-American character actor recognized for his prolific supporting work in ensemble casts across 1980s and 1990s cinema.
He is best known for his portrayals of 3-D in Back to the Future, Billy Tessio in Stand By Me, and Charley Bowdre in Young Guns.