BREAKING Raphael Certain builds Clarity across Paris & San Francisco Marine biology → neurophysiology → founder $1.3M raised before age 25 20+ person international team Light & sound at 40 Hz, delivered through VR Partnerships with US & UK universities BREAKING Raphael Certain builds Clarity across Paris & San Francisco Marine biology → neurophysiology → founder $1.3M raised before age 25 20+ person international team Light & sound at 40 Hz, delivered through VR Partnerships with US & UK universities
Clarity / Founder & CEO
Raphael Certain, founder and CEO of Clarity
Raphael Certain. The marine-biology dropout who decided the brain was the bigger ocean.
Neurotech • Founder Profile

Raphael
Certain

He chased the ocean to Brest. He ended up rewiring brain rhythms.

Founder and CEO of Clarity, a Franco-American neurotechnology company building a wearable VR headset that delivers personalized light and sound at gamma frequencies. He turned a master's thesis into a venture-backed company on two continents - before he turned 25.

RoleFounder & CEO
BasedParis & San Francisco
CompanyClarity
$1.3M+
Raised by age 24
20+
Team, two continents
40 Hz
The frequency at the core
6+
Academic partners worldwide
The Dispatch

A thesis that refused to stay on the shelf

Most master's theses end in a drawer. Raphael Certain turned his into a company. While studying at the Neurodegenerative Diseases Institute in Bordeaux, he wrote his thesis on a stubborn question: how do you take brain-wave stimulation research, the kind that lives in journals, and translate it into something a real person can use? The answer became Clarity.

Clarity is a Franco-American neurotechnology company, headquartered in two cities that rarely share a time zone gracefully - Paris and San Francisco. Its core product is a wearable virtual-reality headset that delivers personalized light and sound at precise frequencies, built to support and engage the aging brain. The pitch is deceptively simple. The engineering, the neuroscience and the company-building behind it are not.

"Why can we send rockets to space and bring them back, yet still struggle with the aging brain?"

That is the founding question Certain keeps returning to. It is the kind of question that sounds naive until you realize how much work it takes to earn the right to ask it. He earned it the long way - through a childhood lab internship, a marine-biology detour, a year in Quebec, a thesis in Bordeaux and a semester in Silicon Valley.

What makes him unusual is not the science alone. It is that he arrived at it sideways, taught himself the parts nobody assigned him, and then convinced investors, scientists and patients-in-trials to bet on a 20-something with a headset and a thesis.

#neurotech#founder#gamma-stimulation#virtual-reality#deeptech#franco-american
The Long Way Round

From a sleep lab at 13 to a company at 24

Age 13
Interns at a CNRS neuroscience lab in Toulouse, watching researchers study sleep and dreams. The spark catches early.
Age 17
Moves to Brest to study marine biology, pulled by a love of the ocean. The plan was fish. The future was neurons.
Quebec
Bachelor's year in Trois-Rivieres - he calls it one of the best years of his life. Locked out of marine-biology courses, he improvises a biology-psychology path and finds neurophysiology.
Bordeaux
Master's at the Neurodegenerative Diseases Institute. His thesis - translating brain-wave stimulation to humans - becomes the seed of Clarity.
X-HEC
MSc X-HEC Entrepreneurs, with a semester at UC Berkeley. Mentors, community and a runway into Silicon Valley.
Clarity
Founds the company. Builds the headset, the team and the science around it.
By 24
Raises $1.3M+, assembles a 20+ person international team, and signs partnerships with leading universities in the US and UK.
2024
First clinical feasibility and safety study completed, with results published in Scientific Reports.
Under The Hood

Light, sound, and a very specific number

Clarity's approach is built on a decade of peer-reviewed neuroscience and groundbreaking MIT research. The premise: deliver gentle, rhythmic light and sound at gamma frequency, package it inside an immersive VR experience, and make it comfortable enough that someone will actually keep using it. The number that keeps coming up is 40 Hz.

STEP 01

Immerse

A wearable VR headset creates a focused, engaging sensory environment.

STEP 02

Stimulate

Personalized pulses of light and sound are delivered at precise gamma frequencies.

STEP 03

Entrain

The stimulation helps train brain activity toward the targeted rhythm.

STEP 04

Measure

Biosensors track engagement and response, feeding a structured neural dataset.

What Certain optimized for

Founder priorities, in his own framing - comfort and engagement matter as much as the science

Patient comfort
High
Engagement
High
Precision (Hz)
Tight
Non-invasive
By design
In His Own Words

On leadership, doubt, and design

"Leadership requires balancing opposing traits at the same time - confidence and humility, conviction and openness, firmness and flexibility."Raphael Certain
"There is no perfect recipe. You adapt, you learn - sometimes painfully - and you keep moving forward."On resilience
"Clarity means having perfect control of your health, and striving for health that is perfectly integrated into our daily lives."On the name
"It was one of the best decisions I have ever made. But not an easy one. You have to invest in the program, and in yourself - and then turn that investment into something meaningful."On X-HEC Entrepreneurs
The Character Study

A self-taught founder in a field that demands credentials

01 / CURIOUS

The early spark

At 13 he was already in a lab watching scientists study sleep and dreams. Most kids that age are chasing a different kind of screen time.

02 / RESOURCEFUL

Learned by doing

With no business background, he taught himself entrepreneurship by reading, networking with founders and launching small ventures.

03 / DESIGN-MINDED

The product joy

His favorite part of the job is the creative act of turning underused scientific knowledge into something tangible and useful.

04 / MISSION-DRIVEN

It got personal

Aging grandparents and the universality of brain aging give his work an urgency he doesn't have to manufacture.

05 / ADAPTABLE

The pivot habit

Marine biology to neurophysiology, France to Quebec to California - he treats a closed door as a redirect, not a dead end.

06 / BRIDGE-BUILDER

Two cultures, one company

Clarity runs across Paris and San Francisco, with a scientific and medical advisory board spanning UCSF, Nottingham, Glasgow and Barcelona.

Margin Notes

Five things that don't fit the resume

He wanted the sea

Before the brain, there was the ocean. He moved to a coastal city at 17 to study marine biology. The pivot to neurons came later.

Quebec, fondly

His bachelor's year in Trois-Rivieres is one he describes as one of the best of his life - cold winters, warm memory.

A semester at Berkeley

The X-HEC Entrepreneurs program sent him to UC Berkeley, the on-ramp to building a company with a San Francisco footprint.

Outsider's advantage

He builds in a field he was never formally trained in as a businessperson, learning the company-building craft entirely on the fly.