Biography
Although he worked steadily from the mid-'70s into the late '90s, the acting career of John Blythe Barrymore never reached the heights of those of his grandfather
John Barrymore or of his half sister
Drew Barrymore. Appearing both on stage and in film, he also performed occasional television work, including voiceovers. In the late '90s, he left acting to become a software developer. John Blythe Barrymore's great-grandfather,
Maurice Costello, was a silent movie actor, as was his grandmother
Dolores Costello and her sister
Helene Costello. His father,
John Drew Barrymore, and mother,
Cara Williams, were also actors. ~ All Movie Guide