Jack Walsh became well-known as an actor, making numerous appearances on the big screen throughout his time in Hollywood. Early in his career, Walsh took on roles in several films, such as the comedy-drama Educating Rita (1983), where he starred alongside Michael Caine. He later appeared in Straight Talk (1992), sharing the screen with Dolly Parton, and Equinox (1993), which featured Matthew Modine. Jack Walsh also showcased his talent in the comedic film The Family (1994), directed by Sean McGinley, and played a role in Feeling Minnesota (1996).

As the entertainment industry evolved, Walsh continued to build his resume with appearances in a variety of projects during the late ‘90s and early 2000s. Among these were notable contributions to television specials like Atlanta Symphony: Christmas With Robert Shaw (PBS, 1998–99) and Jessye Norman – A Holiday Homecoming (PBS, 1998–99). He also appeared in The Straight Story (1999) and was part of the cast in Here on Earth (2000), which starred Chris Klein.

In addition to his film work, Jack Walsh expanded into television, taking on a recurring role in the popular series Scrubs (2001–2010). He also appeared in the Showtime TV movie Bobbie’s Girl (2001–02), further demonstrating his versatility as an actor. In more recent years, Walsh was seen in the horror sequel Insidious: Chapter 2 (2013), starring Patrick Wilson.