People

Sam Altman

Sam Altman was cofounder and CEO of Loopt, which was funded by Y Combinator in 2005 and acquired by Green Dot in 2012. At Green Dot, he was the CTO and is now on the Board of Directors. Sam also founded Hydrazine Capital. He studied computer science at Stanford, and while there worked in the AI lab.

Trevor Blackwell

Trevor Blackwell is a roboticist who in 2007 built the first dynamically balancing biped robot. He has published papers on congestion control in high speed wide area networks, signalling protocol architecture, and file system performance. He has a BEng from Carleton, and a PhD in Computer Science from Harvard.

Tim Brady

Tim Brady was co-founder of Imagine K12, an edtech accelerator that merged with YC in 2016. Prior to that, Tim was Yahoo's first employee in 1995 and wrote the business plan that attracted Yahoo's first venture capital. Tim spent eight years as Yahoo's Chief Product Officer. He holds a BS in electrical engineering from Stanford and and MBA from Harvard.

Paul Buchheit

Paul Buchheit is the creator of GMail. While at Google he also built the prototype for AdSense, and came up with Google's now famous slogan "Don't be evil." In 2007 he was one of the founders of Friendfeed, which in 2009 became Facebook's largest acquisition to date. He has a BS and MS in Computer Science from Case Western Reserve University.

Dalton Caldwell

Dalton Caldwell was the cofounder and CEO of imeem (acquired by MySpace in 2009), and the cofounder and CEO of App.net. He has a BS in Symbolic Systems and a BA in Psychology from Stanford University.

Jared Friedman

Jared Friedman was cofounder of Scribd, which was funded by Y Combinator in 2006 and grew to be one of the top 100 sites on the web. Jared previously worked at a pioneering AI company and studied computer science at Harvard.

Paul Graham

Paul Graham is the author of On Lisp (1993), ANSI Common Lisp (1995), and Hackers & Painters (2004). In 1995, he and Robert Morris started Viaweb, the first SaaS company, which in 1998 became Yahoo Store. In 2002 he discovered a simple spam filtering algorithm that inspired the current generation of filters. He has an AB from Cornell and a PhD in Computer Science from Harvard.

Kevin Hale

Kevin Hale was cofounder of Wufoo, which was funded by Y Combinator in 2006 and acquired by SurveyMonkey in 2011. He was responsible for Wufoo's much-admired design and speaks widely about UX. Before Wufoo he wrote about design for Particletree and was editor in chief of the web development magazine Treehouse. He has a BA from Stetson University in Digital Arts and English.

Aaron Harris

Aaron Harris was cofounder of Tutorspree, which was funded by Y Combinator in 2011. Before Tutorspree he worked at Bridgewater Associates, where he managed product and operations for an analytics group. He has an AB in History and Literature from Harvard.

Justin Kan

Justin Kan was the cofounder and CEO of Exec, and founder of Justin.TV. At Justin.tv, he launched TwitchTV and incubated Socialcam. Prior to Justin.tv, Justin founded Kiko, the world’s first AJAX calendar, which was funded by YC in 2005 and sold to Tucows in 2006. He graduated from Yale University with a BA in Physics and Philosophy.

Carolynn Levy

Carolynn Levy was previously at Wilson Sonsini Goodrich and Rosati, where she helped hundreds of startups with legal questions. She has a BA in political science from UCLA and JD from the USF School of Law, and is a member of the State Bar of California.

Jon Levy

Jon Levy previously counseled public and private technology companies as an attorney for Wilson Sonsini Goodrich and Rosati. He also ran ThinkEquity's private placement department and worked as a Managing Director at Merriman Curhan & Ford. Jon earned a J.D. from the University of Michigan Law School, and a B.A. in English Literature and Religious Studies from Wesleyan University.

Jessica Livingston

Jessica Livingston was previously VP of marketing at investment bank Adams Harkness, where she managed an award-winning rebranding of the company. She is the author of Founders at Work (2007), a book of interviews with startup founders. She has a BA in English from Bucknell.

Kat Manalac

Kat Manalac was Chief of Staff to Alexis Ohanian, cofounder of reddit, before joining YC as its Director of Outreach. Prior to that, Kat was at WIRED Magazine where she managed brand and strategy. Kat has a BS in Communications from Northwestern University.

Robert Morris

Robert Morris is a professor of computer science at MIT, where he is a member of the PDOS group. He has published extensively on wireless networks, distributed operating systems, and peer-to-peer applications. In 1988 his discovery of buffer overflow first brought the Internet to the attention of the general public. He has an AB and PhD in Computer Science from Harvard.

Kirsty Nathoo

Kirsty Nathoo was previously an audit manager at PwC based in Cambridge UK, where she audited tech and biotech companies ranging from startups to public companies. She has an MEng in electrical and information sciences from Cambridge, and qualified as a Chartered Accountant with the Institute of Chartered Accountants in England and Wales.

Geoff Ralston

Geoff Ralston was a founder of Four11, where he built RocketMail, one of the first web mail services, which in 1997 became Yahoo Mail. At Yahoo Geoff worked in engineering, then ran a business unit, then became Chief Product Officer. After Yahoo he was CEO of Lala, which was acquired in 2009 by Apple. He has an AB in Computer Science from Dartmouth, an MS in Computer Science from Stanford, and an MBA from INSEAD.

Ali Rowghani

Ali Rowghani is Managing Partner of YC Continuity. Previously, he served as the Chief Operating Officer of Twitter, Inc. from 2012 to 2014 and as Twitter’s Chief Financial Officer from 2010 to 2012. For the 8 years prior to his time at Twitter, Ali served in several roles at Pixar Animation Studios, Inc., including as Chief Financial Officer and as Senior Vice President of Strategic Planning. Ali holds a BA and MBA, both from Stanford University.

Michael Seibel

Michael Seibel was the cofounder and CEO Justin.tv and Socialcam. Socialcam sold to Autodesk in 2012 and under the leadership of Emmett Shear, Justin.tv became Twitch.tv and sold to Amazon in 2014. Before getting into startups, he spent a year as the finance director for a US Senate campaign and in 2005, Michael graduated from Yale University with a BA in political science.

Qasar Younis

Qasar Younis was the founder and CEO of TalkBin, which was funded by Y Combinator and acquired by Google. At Google, Qasar went on to be the product lead for business facing product. He has a BS in Mechanical Engineering from Kettering University and a MBA from Harvard.