Biography
Casey Siemaszko is an American actor born Kazimierz Andrew Siemaszko on 17 March 1961 in Chicago, Illinois. He is known for supporting roles in 1980s films including Back to the Future (1985) as 3-D, Stand by Me (1986) as Billy Tessio, Young Guns (1988) as Charley Bowdre, and Back to the Future Part II (1989) as 3-D, as well as Of Mice and Men (1992) as Curley.
Siemaszko graduated from the Goodman School of Drama at DePaul University in 1983, having attended Saint Ignatius College Preparatory School. His father, Konstanty Siemaszko (1918–1999), was a Polish Underground fighter and survivor of the Sachsenhausen concentration camp who later worked as a choreographer in Chicago; his mother, Collette McAllister (1931–2008), was English. His sister, Nina Siemaszko, is also an actress. He narrated the 1998 documentary The Polish-Americans.
