#834: David Baszucki, Co-Founder of Roblox — The Path to 150M+ Daily Users, Critical Business Decisions, Ketogenic Therapy for Brain Health, Daily Routines, The Roblox Economy, and More

Hey everyone, Tim Ferriss here. Today’s guest is David Baszucki, founder and CEO of Roblox, which started back in 2004 and grew from early lessons at his first company, Knowledge Revolution, into a global platform recognized for innovation.

Before we dive into business, I have to ask about your customized kettlebells. How did you make them look so good?

I took my iron bells to an auto shop that paints lowriders and had them sprayed in sparkling cherry red, orange, and green; they make training feel playful.

We actually connected through metabolic health, thanks to Dominic D’Agostino and Chris Palmer. Would you share what happened early in your son’s freshman year?

He had a severe manic episode at Berkeley that began an eight to nine year ordeal of hospitalizations, locked wards, and trial after trial of medications; what finally moved the needle—shockingly—was a medically guided ketogenic diet that produced improvements within a month.

Why was December of 2017 such a turning point?

He ran off, went fully manic, and drifted to Southern California; I found him in a Starbucks, coaxed him to visit a relative who’s a psychiatrist, and we got him to an ER by first addressing injured hands, which led to admission and, crucially, a sliver of insight to accept help.

I read your wife’s account of that week and it’s heartbreaking. Mechanistically, why might ketosis help where drugs failed?

Most of us run on glucose, which can spike and crash; ketosis provides a steadier fuel—ketones—that can stabilize brain energy, and under a strict plan with very low carbohydrates and adequate fat, my son saw benefits we hadn’t seen with twenty-plus medications.

How did you make strict keto doable day to day?

Precision matters; we once slipped in Mexico by undercounting carbs in avocados and symptoms crept back until we tightened to fish with butter and olive oil; restaurants can work if you skip bread, lose the bun, and add fat, though events with fixed menus are tough, and my son stays nearly carnivore to keep it simple.

My own go-to is two big salads in an eight-hour window with lots of olive oil and a sliced steak, and I watch protein because too much can bump me out of ketosis.

Exactly; protein is not unlimited, and ratios matter.

What do you use to track ketones?

Finger sticks work, CGMs give glucose context, and continuous ketone monitors are emerging in Canada; beyond numbers, I can feel a calm, grounded optimism at modest ketone levels, whereas glucose swings make problems feel unsolvable.

Ketosis changes a lot for me: I need fewer hours in bed, wake sharp, and even see wild jumps in breath-hold capacity, though I don’t recommend pushing it.

I used to fear insomnia, but now I treat wakeups as bonus learning time and go back to sleep; more broadly, I think we should address the brain’s “machinery” first—energy and inflammation—before relying on talk therapy alone.

Agreed; without the physiological base, talk-only can feel like spinning wheels and even feed hopelessness.

Switching gears, do you still work to ambient music?

All the time; the Atmospheric Calm playlist on Spotify is perfect, and I avoid lyrics so I can think.

For listeners new to Roblox, what is it, and where is it headed with things like dreaming in real time?

It’s a massive, user-created 3D platform where people play, learn, and increasingly connect, with approximately 120 million daily users; we’ve built for all ages with strict safety layers, and we see it evolving into 3D calling, concerts, and events that feel closer to a holodeck than a video grid.

How did you land on the creator economy and Robux?

We moved from a stale membership model to a real digital economy inspired by the real world—people buy a currency, creators sell in-experience items, and creators can cash out—which aligned revenue with time spent and lit a fire under builders within hours of launch.

Was there a fallback if it flopped?

We had conviction; after chasing small fixes, we committed to the hard, obvious system and trusted it would scale with the platform.

What about copycats of hits like Grow Garden?

Names and assets can be protected, but gameplay patterns usually cannot; we use search and discovery to surface the true original so people find the right one, while not forbidding similar experiments.

What key choices helped Roblox succeed?

We favor creator earnings over squeezing profit, and even our economy team optimizes for engagement and enjoyment first, within a mission to grow with civility rather than growth at any cost.

And a mistake you learned from?

We once built clan and ranking features ourselves instead of empowering creators to do it, which we scrapped; a better bet was pushing early into phones because it felt inevitable, even when most of the company doubted 3D on mobile.

Any niche favorites you enjoy on the platform?

I love deep role-play like an airline sim where everyone has a job, and I’m a sucker for digital model railroading; millions create, thousands make a living, and the top tier earns seven figures.

How can kids be extra safe, and how can parents help?

Keep them inside Roblox where text is filtered and image sharing for younger users is blocked; use parental controls, and know we design assuming many ten-year-olds already have phones and try older apps.

What’s next for safety tech?

We’re rolling out AI-driven safety at scale, including age estimation via phone cameras to cluster interactions by age and continuous monitoring for critical harms, on top of universal text and voice moderation.

How long has Roblox been an AI shop?

We run hundreds of in-house models for safety, recommendations, translation, and now AI-assisted 3D creation, with an eye toward worlds that build and evolve around you in real time.

Give us a sense of timelines for that holodeck future.

An AI-generated feature film could be a few years away, personalized continuous video streams feel close, truly photorealistic concerts with huge shared audiences are a big technical lift but coming, and lightweight AR glasses will bring this into daily life.

Going public brings more voices; how do you protect the early values as you build, and how does that show up in features like Roblox Moments, which sounds like short video and might compete with STEM-style learning on the platform?

People switch between two modes: hanging out with friends and consuming stories solo. We’re building for connection, and Moments is a gentle discovery layer so you can see what friends are doing and jump in, while the platform keeps nudging millions toward coding, art, and even economics.

What’s hard about being a public company CEO?

If the system is healthy, you make long-term bets; when you’re in fight-or-flight, you default to short-term tactics. I try to keep my physiology steady so strategy beats urgency.

Walk us through the self-care that keeps you at your best.

Daily movement and sun, almost no alcohol, a mild and steady ketosis, an early afternoon eating window, and getting to bed earlier form my base.

What do meals look like?

Very low carb with plenty of meat, eggs, and butter, plus greens and other vegetables.

Any non-negotiable training?

CrossFit three days a week and weighted-vest hikes most other days.

What do you track?

I train at home with a coach and only scan my Oura about monthly for stress, cardio age, lowest sleeping heart rate, HRV, and temperature. I’ve used CGMs and ketone monitors to dial diet, and I recommend CGMs—at Roblox we offer them and label office snacks by whole-food and good-energy axes, and people keep reporting sharper focus and major weight loss.

Books you gift or recommend?

Finite and Infinite Games, the original, reframed Roblox as a decades-long game for me.

Any that shaped you as a founder?

I rarely enjoy business books; I devoured explorer tales—Magellan, Captain Cook, Mutiny on the Bounty, Joshua Slocum, Amundsen and Scott—which taught me preparation and endurance beat bravado.

Billboard message to the world?

Feed your head.

Anything else to add or point people to?

Thanks for having me. Inspired by your coffee experiments, I’ll add that heavy cream in coffee is a simple way to lean into ketosis.

Use heavy cream rather than half and half; it even helped classic ketogenic therapy. We’ll link everything in the show notes. Be a little kinder than needed to others and to yourself, and remember sometimes the fix is physiological, not just mental. If you want a short weekly note with what I’m testing, sign up for Five Bullet Friday at tim dot blog slash friday.