Casey Siemaszko

Casey Siemaszko is an American actor renowned for his versatile supporting roles that helped define the cinematic landscape of the 1980s and early 1990s. Born Kazimierz Andrew Siemaszko on March 17, 1961 in Chicago, Illinois, he grew up on the city’s northwest side where a rich multicultural heritage shaped his early worldview. His father, Konstanty Siemaszko, was a Polish Roman Catholic who survived the Sachsenhausen concentration camp before emigrating to the United States and becoming a celebrated choreographer within Chicago’s Polish community, while his mother, Collette McAllister, contributed an English lineage to the family tapestry. Casey attended Saint Ignatius College Preparatory School before honing his craft at the Goodman School of Drama (now The Theatre School) at DePaul University, earning a BFA in 1983. That same year marked the beginning of his professional journey, launching a career that would span decades and encompass iconic films such as Back to the Future—where his brief yet memorable turn contributed to the movie’s cultural zeitgeist—and the coming‑of‑age classic Stand By Me, where his performance added depth to the ensemble. His breakout leading roles in Three O’Clock High and the revisionist Western Young Guns showcased his ability to command the screen, blending youthful intensity with a gritty authenticity that resonated with audiences.---Beyond the silver screen, Siemaszko’s extensive television work, voice work in video games, and occasional stage appearances reflect a commitment to diverse storytelling mediums. He shares his artistic legacy with his sister Nina Siemaszko, also an actress, and his brother Corky, a journalist and writer, underscoring a family deeply embedded in creative pursuits. While he keeps his personal life largely private, Casey’s enduring presence in Hollywood highlights a dedication to his craft that continues to inspire emerging talent.