Marie Van Brittan Brown is important because she invented the first home security system in 1966, creating the foundational design behind virtually every modern video doorbell, closed-circuit camera system, and home security setup in use today. Working with her husband Albert, an electronics technician, Brown filed a patent for an audio-video alarm system that was granted as U.S. Patent 3,482,037 in December 1969.
The Problem She Set Out to Solve
Brown was a nurse in Queens, New York, who often worked night shifts. That schedule meant she was frequently home alone at odd hours in a neighborhood where, like much of 1960s urban New York, crime was a real concern and police response times were slow. As she told The New York Times in 1969, “it takes considerable time to dial the police and get action in an emergency.” Rather than accept that reality, she designed a system that would let a woman alone in the house see who was at her door, talk to them, and alert authorities instantly if something was wrong.
How Her System Worked
The invention was remarkably sophisticated for 1966. A cabinet mounted on the inside of the front door held a camera that could slide up and down via an electric motor. The door had a series of small peepholes at different heights, and the camera would uncover them one at a time, so it could capture an image of a tall adult or a small child. The video feed was transmitted to a receiver in the bedroom that resembled a small television set, displaying a live picture of whoever was standing outside.
Two-way microphones allowed Brown to speak with the visitor without opening the door. From her bedside control panel, she could then choose to unlock the door remotely, sound a siren, or press a button that would alert police or a central security office. If the building had a shared security station, the system could transmit both the video image and the audio conversation to it, and the exchange could even be recorded.
The patent drawings describe all of this in detail: the motorized scanner, the small monitor screen, the speaker and microphone for two-way communication, and separate buttons for the lock, a guard alert, and the siren.
Why the Invention Still Matters
Every core feature of Brown’s 1966 design maps directly onto technology that millions of people use today. Video doorbells like Ring and Nest let you see who’s at the door on a screen, talk to them through a speaker, and unlock the door remotely. Home security systems send instant alerts to monitoring centers. Recorded video of visitors is now standard. Brown didn’t just come up with one of these ideas. She integrated all of them into a single, cohesive system more than half a century before they became mainstream consumer products.
Her patent is considered the foundation of the modern home security industry. The concept of combining closed-circuit video, two-way audio, remote access control, and a panic button in one residential system originated with her design. Those four elements remain the backbone of home security today.
Recognition and Representation
The New York Times covered the patent’s approval on December 6, 1969, describing the Browns as “a New York couple, disturbed at urban crime” who had “patented an audio-video alarm system for household protection.” The article detailed how the system could scan and interview a visitor at the door and either admit them or sound an alarm, all operated from the bedroom.
Brown’s significance extends beyond the invention itself. She was a Black woman working as a nurse, not an engineer, who identified a real problem in her daily life and built a technological solution to it. Her husband Albert contributed his electronics expertise, but the concept and the patent filing originated with Marie. In a field and an era where Black women inventors were rarely acknowledged, her patent stands as documented proof of a contribution that shaped an entire industry. The Lemelson-MIT Program, which highlights significant American inventors, recognizes her as a key figure in the development of home security technology.
Brown died in 1999, three decades after her patent was granted. By then, the home security market was already a multibillion-dollar industry built on the very principles she had laid out in her Queens apartment in the mid-1960s.