American screen actor, musician, instrumentalist, songwriter, voice actor, author and a figure in the science-fiction community. He came to prominence in the 1960s as a child actor, when he was credited as Billy Mumy, an era which included appearances in The Twilight Zone and Alfred Hitchcock Presents television shows, as well as co-starring in the film Dear Brigitte, followed by an iconic three-season role as Will Robinson in the CBS sci-fi TV series Lost in Space (1965-1968).
He later appeared as lonely teenager Sterling North in the Disney film Rascal (1969), and he played Teft in the film Bless the Beasts and Children (1971).
In the 1990s, he performed the role of Lennier in all five seasons of the syndicated sci-fi TV series Babylon 5, and narrated A&E Network's Emmy Award-winning series Biography.
Mumy is also known for his musical career as a guitarist, singer, songwriter and composer: he is an Emmy nominee for original music in Adventures in Wonderland (1991). As a musician Mumy performs as a solo artist, an occasional guest performer, and as half of the duo Barnes & Barnes.
In 2018, Mumy appeared in the pilot episode of the Netflix remake series, Lost in Space. His character's name is Dr. Z. Smith, in homage to the character played by Jonathan Harris in the 1965 television series.
Link to Wikipedia biography
