Bill Mumy the iconic Will Robinson from Lost in Space, Babylon 5 star, and musician. Discover his age, net worth, wife, children, and 60-year career in 2026.
Bill Mumy is one of Hollywood’s most enduring success stories. Born on February 1, 1954, in San Gabriel, California, he made his mark as a child actor and never stopped working. Most audiences remember him as Will Robinson on the beloved 1960s sci-fi series Lost in Space, a role he first played at just 11 years old. That performance made him a household name — and it turned out to be only the beginning.
What sets Mumy apart from most child stars is what came after. Over the next six decades, he built a remarkably diverse career spanning television, film, voice acting, music, comic book writing, and radio. Today, at 72, he remains active and genuinely beloved by fans around the world.
Key Facts About Bill Mumy
| Detail | Information |
|---|---|
| Full Name | Charles William Mumy Jr. |
| Date of Birth | February 1, 1954 |
| Age | 72 (as of 2026) |
| Birthplace | San Gabriel, California, USA |
| Profession | Actor, Musician, Writer, Voice Artist, Producer |
| Net Worth | Approx. $10 million (2026) |
| Spouse | Eileen Joy Davis (married 1986) |
| Children | Seth Mumy, Liliana Mumy |
| Education | Santa Monica City College (1972–73) |
| Famous For | Will Robinson in Lost in Space; Lennier in Babylon 5; “Fish Heads” with Barnes & Barnes |
Early Life: A Cul-de-Sac Kid With Star Power
Bill Mumy grew up in West Los Angeles in a neighbourhood he has described warmly as a classic 1950s American childhood — kids at every house, constant outdoor play, and a deep love of television. His father, Charles William Mumy Sr., was a cattle rancher. His mother, Muriel Gertrude Gould Mumy, was the one who recognized her son’s spark for performing.
His path to acting started with an accident. As a young child, he broke his leg while playing and spent his recovery glued to the television. That experience ignited his desire to be on screen. His mother enrolled him in Romper Room, a nursery-school-style show, to test how he’d handle cameras and lights. He passed with flying colours. The family soon got an agent, and Mumy was off to the races.
His father’s cattle-ranching background was worlds away from Hollywood, but both parents made a conscious effort to keep young Bill grounded. As Mumy later reflected, his parents invested his earnings wisely and never let fame go to his head — a protective instinct that spared him the financial ruin that plagued many of his contemporaries.
Education
Mumy attended school in the Los Angeles area throughout his childhood and early teen years, balancing academics with a rapidly expanding acting schedule. After his entertainment career took off, he briefly attended Santa Monica City College from 1972 to 1973. His real education, however, was happening on set — studying actors and directors he idolised and absorbing the craft firsthand from some of television’s biggest names.
From Twilight Zone to Will Robinson: His Breakthrough Years
Mumy earned his first acting role around age six on the TV series National Velvet. From there, he appeared in a string of iconic shows that would define American television in the early 1960s. His guest role as Anthony Fremont in The Twilight Zone episode “It’s a Good Life” (1961) — a terrifying child with absolute power — remains one of the most memorable performances in that series’ history.
He also appeared in Alfred Hitchcock Presents, Bewitched, I Dream of Jeannie, and dozens of other top-rated programmes of the era. By the time Lost in Space launched in 1965, he was already one of the most experienced child performers in the business. The series ran for three seasons on CBS until 1968, and Mumy later said its cancellation genuinely devastated him.
Mumy appeared in more than 400 television episodes and 18 feature films during his childhood and adolescent years alone. Notably, he was reportedly the first choice to play Eddie Munster on The Munsters in 1964, but his parents declined due to the heavy makeup involved. The role went to Butch Patrick instead.
Adult Career: Babylon 5, Voice Acting, and Beyond
Rather than fade into nostalgia, Mumy reinvented himself. In the 1990s, he landed the recurring role of Lennier in the acclaimed sci-fi series Babylon 5, appearing across all five seasons — 47 episodes in total. The role introduced him to an entirely new generation of science-fiction fans and proved he had lost none of his on-screen charisma.
His voice acting career ran parallel and proved equally prolific. He lent his voice to animated series including Batman: The Animated Series, Animaniacs, Scooby-Doo, and Ren & Stimpy. He also narrated more than 50 episodes of the Emmy Award-winning A&E series Biography, a role that kept him in living rooms across America throughout the 1990s and 2000s.
In 2018, Mumy returned to the Lost in Space universe in Netflix’s remake, this time playing Dr. Zachary Smith — the very villain his childhood character had sparred with for three seasons. He also voiced Lennier in the 2023 Babylon 5 revival. His memoir, Danger, Will Robinson: The Full Mumy, published in 2022, became a fan favourite and offered an unvarnished look at his decades in the industry.
The Music Side: Barnes & Barnes, “Fish Heads,” and Solo Work
Fewer people know that Bill Mumy is a seriously accomplished musician. He plays guitar, bass, banjo, mandolin, keyboards, harmonica, and percussion. He has written and recorded songs with the band America and toured with artists including Shaun Cassidy and Rick Springfield.
His most famous musical venture was Barnes & Barnes, a comedic rock duo he formed with his longtime collaborator Robert Haimer. Their novelty hit “Fish Heads” became a cult classic — Rolling Stone named its music video one of the 100 greatest videos of all time. The duo released nine albums together before Haimer’s passing in 2023.
Mumy also formed the Action Skulls in 2017 with John Cowsill and Vicki Peterson, releasing the album Angels Hear that same year. He hosts The Real Good Radio Hour, a weekly show on KSAV Internet Radio, and was Emmy-nominated for original music composed for Adventures in Wonderland (1992).
Personal Life: A Grounded Family Man
Despite growing up under Hollywood’s spotlight, Mumy has maintained a remarkably stable personal life. He married Eileen Joy Davis on October 9, 1986, and the couple has been together ever since — a rarity in the entertainment industry. Eileen worked as a childbirth educator and later as a preschool teacher; Mumy has spoken warmly about joining her classroom to sing for the children.
Together, they have two children. Their son Seth pursued acting, as did their daughter Liliana, who has built her own career as a voice actress. Mumy became a grandfather in recent years and has shared playful social media moments singing alongside his grandchildren — a full-circle reflection of a life built on creative joy. The family lives in the Hollywood Hills, California.
Net Worth and Career Earnings
<cite index=”20-1″>Bill Mumy’s net worth is estimated at approximately $10 million as of 2026.</cite> His wealth comes from multiple streams built over more than six decades: acting residuals from Lost in Space and Babylon 5, voice-over work and commercial narration for brands including McDonald’s, Ford, Mattel, and Walmart, music royalties from Barnes & Barnes and his solo catalogue, and a sustained convention circuit presence. <cite index=”22-1″>Unlike many child stars, Mumy never suffered financially, largely because his parents invested his earnings wisely from the very beginning.</cite>
Awards, Recognition, and Legacy
Mumy received the Inkpot Award in 2015 at San Diego Comic-Con, one of the most respected honours in genre entertainment. He holds an Emmy nomination for original music composition. More broadly, his legacy rests on something harder to quantify — the fact that he never became a cautionary tale.
He beat the child-star curse through versatility, discipline, and a willingness to keep finding new creative spaces. His career now spans over 60 years, which places him among a tiny handful of performers who have worked continuously from childhood into their 70s.
The Bottom Line
Bill Mumy’s life reads like a blueprint for longevity in an industry that rarely rewards it. He turned childhood fame into a launching pad rather than a ceiling, and he did it by refusing to be defined by any single role or medium.
From The Twilight Zone to Babylon 5 to a novelty song beloved by generations, Mumy kept showing up — curious, multi-talented, and genuinely delighted to be working. That consistency, more than any single achievement, is his greatest accomplishment.
At 72, with grandchildren singing his songs in a California preschool, it’s hard to imagine a happier ending. But knowing Bill Mumy, it probably isn’t an ending at all.
Frequently Asked Questions
Q1: Who is Bill Mumy?
Bill Mumy is an American actor, musician, writer, and voice artist born on February 1, 1954, in San Gabriel, California. He is best known for playing Will Robinson in the 1960s CBS series Lost in Space and Lennier in Babylon 5. As of 2026, he remains active in entertainment at age 72.
Q2: What is Bill Mumy’s net worth in 2026?
Bill Mumy’s net worth is estimated at approximately $10 million as of 2026. His earnings come from acting residuals, voice-over work, commercial narration, music royalties, book sales, and fan convention appearances. His parents’ wise management of his childhood earnings also helped him avoid the financial pitfalls that troubled many former child stars.
Q3: Who is Bill Mumy’s wife?
Bill Mumy married Eileen Joy Davis on October 9, 1986. The couple has been together for nearly four decades and has two children, Seth and Liliana, both of whom have pursued acting careers. They live in the Hollywood Hills, California.
Q4: What is Bill Mumy doing now in 2026?
Mumy continues to make fan convention appearances and remains involved in entertainment projects. He hosts The Real Good Radio Hour on KSAV Internet Radio and stays active on social media, including sharing videos with his grandchildren. He made public appearances confirmed for 2026 and continues to be a fixture in science-fiction fan culture.
Q5: What was Bill Mumy’s most famous role?
Mumy’s most iconic role is Will Robinson in Lost in Space (1965–1968), which he played from ages 11 to 14. He also played the terrifying child Anthony Fremont in The Twilight Zone episode “It’s a Good Life” (1961) and the Minbari diplomat Lennier across all five seasons of Babylon 5 (1994–1998).
Q6: What is “Fish Heads” and what does Bill Mumy have to do with it?
“Fish Heads” is a comedic novelty song released by Barnes & Barnes, the musical duo Mumy formed with Robert Haimer. Rolling Stone magazine ranked its music video among the 100 greatest ever made. Mumy and Haimer released nine albums together before Haimer passed away in 2023.
Q7: Did Bill Mumy appear in the Netflix Lost in Space reboot?
Yes. Mumy appeared in the 2018 Netflix reboot of Lost in Space, this time playing the villainous Dr. Zachary Smith — the role originally played by Jonathan Harris in the classic series. He also appeared in bonus features on the home video release, reprising his original role as Will Robinson.
