Who Is Casey Siemaszko? Age, : Wealth Report Net Worth 2026: Career Earnings & Assets

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Kazimierz Andrew “Casey” Siemaszko, born on March 17, 1961, in Chicago, Illinois, is an American actor renowned for his versatile roles in film and television. With a career spanning over four decades, he has delivered memorable performances in iconic films such as “Back to the Future,” “Stand by Me,” and “Young Guns.”

In 1992, Casey delivered a compelling performance as Curley in the film adaptation of John Steinbeck’s “Of Mice and Men,” directed by and starring Gary Sinise. This role demonstrated his ability to tackle complex characters and added depth to his acting repertoire.

Net Worth and Financial Overview

As of 2022, Casey Siemaszko’s net worth is estimated to be around $500,000.

Early Life and Family Background

Casey Siemaszko was raised on the northwest side of Chicago in a culturally rich environment. His father, Konstanty Siemaszko, was a Polish Roman Catholic and a former member of the Polish Navy who joined the Polish Underground during World War II. A survivor of the Sachsenhausen concentration camp, Konstanty emigrated to Chicago in 1959, becoming a well-known local choreographer and a fixture in the Polish community. Casey’s mother, Collette McAllister, was of English descent. This diverse heritage provided Casey with a unique perspective and deep appreciation for the arts.

In 1985, Casey secured a supporting role as 3-D, a member of Biff Tannen’s gang, in the now-classic film “Back to the Future.” This role marked a significant milestone in his career, leading to further opportunities in the industry.

His television credits include recurring roles in series such as “NYPD Blue” (1996–2004) as Captain Pat Fraker and “Damages” (2007–2012) as Detective Dan Williams. These roles allowed him to reach a broader audience and showcased his adaptability across different media formats.

Legacy and Impact

Casey Siemaszko’s contributions to film and television have left a lasting impression on audiences and the industry alike. His ability to embody a wide range of characters has earned him recognition and respect among peers and fans. By consistently delivering authentic performances, he has solidified his place in Hollywood history.

Education and Early Career

Casey attended Saint Ignatius College Preparatory School in Chicago, where he began to cultivate his interest in acting. He further honed his craft at DePaul University’s Goodman School of Drama, graduating in 1983. Shortly after, he embarked on his professional acting career, making his film debut in “Class” (1983), a comedy featuring Rob Lowe and Andrew McCarthy.

Career Highlights and Notable Works

Throughout the late 1980s and early 1990s, Casey Siemaszko built an impressive filmography. He portrayed Billy Tessio in “Stand by Me” (1986), a film that has since become a beloved classic. In “Three O’Clock High” (1987), he took on the lead role of Jerry Mitchell, showcasing his versatility as an actor. His performance as Charley Bowdre in “Young Guns” (1988) further solidified his reputation in Hollywood.

This wealth primarily stems from his extensive acting career, which includes numerous film and television roles. While specific details about his assets, such as properties or investments, are not publicly available, his sustained presence in the entertainment industry underscores his professional success.

Personal Life and Interests

Casey Siemaszko is known for maintaining a private personal life. While specific details about his relationships are not publicly disclosed, it is known that he is the older brother of actress Nina Siemaszko. Beyond his acting career, Casey has a keen interest in martial arts, training in disciplines such as Hapkido, Judo, and Tai Chi. He is also a serious Zen student, which reflects his dedication to personal growth and discipline.

Growing up, Casey was surrounded by a family passionate about the performing arts. His sister, Nina Siemaszko, pursued a career in acting, and his brother, Corky Siemaszko, became a writer for the Daily News and a reporter for NBC News. This familial inclination towards the arts undoubtedly influenced Casey’s career path.

His portrayal of diverse roles across various genres showcases his versatility and dedication to his craft. As he continues to engage with new projects, Casey’s enduring talent ensures that his legacy in the entertainment world remains significant.

An avid athlete, Casey competes in Olympic-distance triathlons and plays league soccer, demonstrating his commitment to physical fitness and teamwork. These pursuits highlight his multifaceted personality and dedication to both his craft and personal interests.

In summary, Casey Siemaszko’s journey from his culturally rich upbringing in Chicago to his accomplishments in Hollywood exemplifies his passion for acting and commitment to excellence. His diverse body of work continues to resonate with audiences, reflecting his enduring impact on the entertainment industry.

Disclaimer: Who Is Casey Siemaszko? Age, wealth data updated April 2026.