New York City / Professor · Founder · Investor · Writer

I do a lot of different things. Here are some of them.

I teach at Columbia, I’ve built a couple of companies, I back founders, and I write. I’m a little ADHD – and I’ve never liked “the way it’s always been done.” This is a small subset of the things that hold my attention.

I’m happiest questioning the way things are supposed to be done – whether that’s teaching people to code, helping people overcome addiction, or learning something new just because it pulled me in.

01 The long version

Somehow I ended up as a founder who teaches and a philosopher who codes.

I’m a two-time Y Combinator–backed founder and an award-winning faculty member at Columbia Business School, where I’m also an Innovation Fellow at the Lang Center for Entrepreneurship. I co-founded Ophelia, an online treatment platform for opioid addiction, and One Month, an accelerated learning platform.

I advise founders and executives on growth, scaling, product, and team – and I’ve worked with companies like Goldman Sachs, Bloomberg, Condé Nast, and American Express. I was named to Forbes’ 30 Under 30 in Education, and wrote Python for MBAs.

Before all that, I studied Philosophy and Finance at NYU and wrote my thesis on the metaphysics of consciousness under David Chalmers and Ned Block. I’m still chasing the same thing I was back then: figuring out how things actually work.

Mattan Griffel
Forbes 30 Under 30 2× YC founder NYU Philosophy & Finance
02 Teaching

Award-winning faculty at Columbia Business School.

I teach the things business school usually leaves out – and try to show people how much fun it can be to actually build things.
01
Entrepreneurship

Getting MBAs from an idea to their first customers – helping them avoid some of the avoidable mistakes.

02
Coding for business

Python and data for people who believe they’re “not technical.”

03
AI in business

What AI does and doesn’t change about building a company.

“Truly one of the best professors I've ever had.” – Foundations of Entrepreneurship Student, Summer 2025
03 Building

Two-time Y Combinator founder.

Companies I started because the existing way of doing things didn’t make sense to me.
Co-founder Healthcare
Ophelia

An online treatment platform for opioid addiction that treats it like what it is: a medical problem, not a moral one.

Visit →
Co-founder Education
One Month

An accelerated learning platform built on a simple bet: you can learn to code (or almost anything) in a month if it’s taught right.

Visit →
04 Investing

I’ve angel-invested in 25+ early-stage companies.

Founders I believed in early, across healthcare, consumer, and the unsexy tools other startups run on.
05 Talks & speaking

I give talks. I like the hard questions after.

On entrepreneurship, AI, learning, and building. For audiences of MBAs, founders, and teams.
01 Vibe Coding: How Business Leaders Are Building Software Without Writing Code
02 AI + Entrepreneurship: A Practical Playbook
03 Lessons from two YC startups
04 Learning fast, and questioning defaults
Book me to speak →
06 Writing

I wrote the book on Python for MBAs. Literally.

A book that takes people who thought they’d never code and gives them real, working fluency with Python and data. It came straight out of my classroom, built on the idea that “I’m not technical” is just a story people tell themselves.

Featured in
The New York Times The Wall Street Journal Forbes BusinessWeek MIT Technology Review
07 Advising & coaching

I help founders and execs get unstuck.

Growth, scaling, product, team. Usually the real problem isn’t the one you started with. I’ve worked with teams at Goldman Sachs, Bloomberg, Condé Nast, and American Express, and with early founders figuring it out for the first time.

Goldman Sachs Bloomberg Condé Nast American Express

“He is who I wish I was when I was his age.”

Jay Weintraub · Founder of Grow.co

“Mattan knows more about the tech startup scene in NYC (and in general) than anybody else I know.”

Nico Luchsinger · Founder, Sandbox Network