One Month

One Month shows people how they can take positive steps towards radically changing their lives in a short amount of time. Through online education, we've reached over 15,000 students and taught them how to code. From 14 year-old high schoolers to 19 year-old college dropouts to 40 year-old factory workers, we've helped people all over the world realize that whether they have a computer science degree or people have told them their entire lives that they aren't "smart enough." We're currently expanding our curriculum into other skills such as growth hacking, mobile app development, and online payment processing. Our focus is on fun, motivation, and completion, and as a result boast one of the highest completion rates in all online education – around 25%. For the rest, we make it as personal as possible, with real people that reach out to you and help you when you have a problem.

  • Industry: Education
  • Year Started: 2013
  • Organization Type: For-Profit
  • # of Employees: 5 ( as of Dec 31, 2013)

Mattan Griffel


I'm Mattan, Co-Founder & CEO of Y Combinator-backed One Month, the "For Dummies" of online education. I created One Month Rails, the #1 bestselling Ruby on Rails online training course for teaching beginners how to build web applications. I'm also the NYC Ambassador to the Sandbox Network, a collection of young leaders under 30. I teach and advise on growth hacking, online education, and productivity. I've advised companies like Pepsico, Bloomberg, GM, NYSE, and JPMorgan, spoken at New York University, Cooper Union, Singularity University, The Downtown Project, First Round Capital and Social Media Week, and have been featured in Forbes, BusinessWeek, MIT Technology Review, Huffington Post, Mashable and The Next Web. I studied Philosophy and Finance at New York University and wrote my thesis on the metaphysics of consciousness.

  • Age: 29
  • Ethnicity: Caucasian

Chris Castiglione


Christopher Castiglione is a developer and teacher with a specialty in UX strategy and front-end. He has over ten years of experience developing digital products. In the past, he has designed applications for clients ranging from The Black Eyed Peas, Bacardi, and Toyota. In 2012 and 2013, Christopher spoke at over 70 events on programming and APIs. He's taught at Columbia University, The University of Amsterdam, SXSW, and has provided corporate training for clients ranging from Donors Choose to The New York Stock Exchange and American Express.

  • Age: 37
  • Ethnicity: Caucasian

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