Brian Eric Bonsall was born on December 3, 1981, in Torrance, California. He began his acting career at a young age, gaining recognition for his role as Andy Keaton, the youngest child on the NBC sitcom Family Ties from 1986 to 1989. His performance earned him three Young Artist Awards. In 1992, Bonsall took on the role of Alexander Rozhenko, the son of Worf, in Star Trek: The Next Generation. He played the character in seven episodes across multiple seasons, taking over the role from Jon Steuer, who had portrayed Alexander as a toddler.

     Beyond Star Trek, Bonsall appeared in several films, including Mikey (1992), where he played a disturbed child, Father Hood (1993) alongside Patrick Swayze, and Blank Check (1994), a Disney comedy about a boy who comes into possession of a million dollars. He also starred in television movies such as Do You Know the Muffin Man? (1990) and False Arrest (1991).

     In 1995, Bonsall retired from acting and moved to Boulder, Colorado, where he focused on music. He formed the rock band Late Bloomers in 1998 and later played in punk bands such as Thruster and The Light on Adam's Stereo. In 2016, he joined the rock band The Ataris and toured with them.