Y Combinator relationship map

Family

Business

Social

1964 to 2024

Click anyone to see who they know, or any line to read it

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People in Y Combinator

Trevor Blackwell, YC co-founder, roboticist, from 1969

Robert Tappan Morris, YC co-founder, MIT professor, from 1965

Paul Graham, YC co-founder, president 2005 to 2014, from 1964

Jessica Livingston, YC co-founder, from 1971

Sam Altman, President 2014 to 2019, then OpenAI, from 1985

Geoff Ralston, President 2019 to 2023

Garry Tan, President and CEO since 2023. Founded Posterous, from 1981

Carolynn Levy, Managing director for legal. Wrote the SAFE

Kirsty Nathoo, Chief financial officer

Paul Buchheit, Built Gmail, then a YC partner, from 1977

Michael Seibel, Justin.tv founder, managing director to 2024, from 1982

Jared Friedman, Scribd founder, managing director from 2024

Diana Hu, Escher Reality founder, managing partner

Harj Taggar, Auctomatic and Triplebyte founder, partner

Tom Blomfield, Founded GoCardless and Monzo, from 1985

Gustaf Alströmer, Ran growth at Airbnb

Nicolas Dessaigne, Founded Algolia

Pete Koomen, Founded Optimizely

Andrew Miklas, Founded PagerDuty

David Lieb, Founded Bump, sold to Google

Tyler Bosmeny, Founded Clever

Steve Huffman, Reddit, the first batch, from 1983

Alexis Ohanian, Reddit, the first batch, from 1983

Drew Houston, Dropbox, S07, from 1983

Arash Ferdowsi, Dropbox, S07, from 1985

Justin Kan, Justin.tv, S07, from 1983

Emmett Shear, Justin.tv, then Twitch CEO, from 1983

Kyle Vogt, Justin.tv, then founded Cruise, from 1982

Patrick Collison, Auctomatic W07, then Stripe, from 1988

John Collison, Auctomatic W07, then Stripe, from 1990

Brian Chesky, Airbnb, W09, from 1981

Joe Gebbia, Airbnb, W09, from 1981

Nathan Blecharczyk, Airbnb, W09, from 1983

Brian Armstrong, Coinbase, S12, from 1983

Fred Ehrsam, Coinbase, S12, from 1988

Tony Xu, DoorDash, S13, from 1985

Peter Thiel, Backed Stripe out of the PayPal Mafia, from 1967

Aaron Swartz, Infogami, merged into Reddit, 1986 to 2013

Stanley Tang, DoorDash, S13, from 1992

Andy Fang, DoorDash, S13

Evan Moore, DoorDash, S13

Relationships in Y Combinator

Paul Graham and Jessica Livingston: co-founded YC with (business, confirmed, from 2005) source

Paul Graham and Robert Tappan Morris: co-founded YC with (business, confirmed, from 2005) source

Paul Graham and Trevor Blackwell: co-founded YC with (business, confirmed, from 2005) source

Jessica Livingston and Robert Tappan Morris: co-founded YC with (business, confirmed, from 2005) source

Jessica Livingston and Trevor Blackwell: co-founded YC with (business, confirmed, from 2005) source

Robert Tappan Morris and Trevor Blackwell: co-founded YC with (business, confirmed, from 2005) source

Paul Graham and Jessica Livingston: married to (family, confirmed, from 2008) source

Paul Graham and Robert Tappan Morris: co-founded Viaweb with (business, confirmed, 1995 to 1998) source

Paul Graham and Trevor Blackwell: co-founded Viaweb with (business, confirmed, 1995 to 1998) source

Robert Tappan Morris and Trevor Blackwell: Viaweb together (business, confirmed, 1995 to 1998) source

Paul Graham -> Sam Altman: handed him the presidency (business, confirmed, 2014) source

Sam Altman -> Geoff Ralston: succeeded by (business, confirmed, 2019) source

Geoff Ralston -> Garry Tan: succeeded by (business, confirmed, 2023) source

Paul Graham -> Michael Seibel: brought him in as a part time partner (business, confirmed, 2013) source

Sam Altman -> Michael Seibel: partner under him (business, confirmed, 2014 to 2019) source

Michael Seibel -> Jared Friedman: handed over as managing director (business, confirmed, 2024) source

Garry Tan -> Diana Hu: managing partner under him (business, confirmed, from 2023) source

Garry Tan -> Harj Taggar: managing partner under him (business, confirmed, from 2023) source

Paul Graham -> Paul Buchheit: partner (business, confirmed, from 2010) source

Paul Graham -> Kirsty Nathoo: chief financial officer (business, confirmed, from 2010) source

Paul Graham -> Carolynn Levy: wrote YC's legal paperwork (business, confirmed, from 2013) source

Garry Tan -> Tom Blomfield: general partner under him (business, confirmed, from 2023) source

Garry Tan -> Gustaf Alströmer: general partner under him (business, confirmed, from 2023) source

Garry Tan -> Nicolas Dessaigne: general partner under him (business, confirmed, from 2023) source

Garry Tan -> Pete Koomen: general partner under him (business, confirmed, from 2023) source

Garry Tan -> Andrew Miklas: general partner under him (business, confirmed, from 2023) source

Garry Tan -> David Lieb: general partner under him (business, confirmed, from 2023) source

Garry Tan -> Tyler Bosmeny: general partner under him (business, confirmed, from 2023) source

Steve Huffman and Alexis Ohanian: co-founded Reddit with (business, confirmed, from 2005) source

Paul Graham -> Steve Huffman: funded them in the very first batch (business, confirmed, 2005) source

Paul Graham -> Alexis Ohanian: funded them in the very first batch (business, confirmed, 2005) source

Aaron Swartz -> Steve Huffman: merged Infogami into Reddit (business, confirmed, 2006) source

Aaron Swartz -> Alexis Ohanian: merged Infogami into Reddit (business, confirmed, 2006) source

Paul Graham -> Garry Tan: funded Posterous, S08 (business, confirmed, 2008) source

Drew Houston and Arash Ferdowsi: co-founded Dropbox with (business, confirmed, from 2007) source

Paul Graham -> Drew Houston: funded Dropbox, S07 (business, confirmed, 2007) source

Justin Kan and Emmett Shear: co-founded Justin.tv with (business, confirmed, from 2007) source

Justin Kan and Michael Seibel: co-founded Justin.tv with (business, confirmed, from 2007) source

Justin Kan and Kyle Vogt: co-founded Justin.tv with (business, confirmed, from 2007) source

Emmett Shear and Michael Seibel: Justin.tv together (business, confirmed, from 2007) source

Emmett Shear and Kyle Vogt: Justin.tv together (business, confirmed, from 2007) source

Michael Seibel and Kyle Vogt: Justin.tv together (business, confirmed, from 2007) source

Drew Houston and Justin Kan: batchmates in S07 (social, confirmed, 2007) source

Arash Ferdowsi and Emmett Shear: batchmates in S07 (social, confirmed, 2007) source

Patrick Collison and John Collison: co-founded Stripe with (business, confirmed, from 2009) source

Harj Taggar and Patrick Collison: co-founded Auctomatic with, W07 (business, confirmed, 2007 to 2008) source

Harj Taggar and John Collison: co-founded Auctomatic with, W07 (business, confirmed, 2007 to 2008) source

Peter Thiel -> Patrick Collison: backed Stripe early (business, confirmed, from 2010) source

Brian Chesky and Joe Gebbia: co-founded Airbnb with (business, confirmed, from 2008) source

Brian Chesky and Nathan Blecharczyk: co-founded Airbnb with (business, confirmed, from 2008) source

Joe Gebbia and Nathan Blecharczyk: co-founded Airbnb with (business, confirmed, from 2008) source

Paul Graham -> Brian Chesky: funded Airbnb, W09 (business, confirmed, 2009) source

Gustaf Alströmer -> Brian Chesky: ran growth for him (business, confirmed, 2012 to 2017) source

Brian Armstrong and Fred Ehrsam: co-founded Coinbase with (business, confirmed, from 2012) source

Fred Ehrsam -> Steve Huffman: the two met through Reddit (social, reported, 2012) source

Tony Xu and Stanley Tang: co-founded DoorDash with (business, confirmed, from 2013) source

Tony Xu and Andy Fang: co-founded DoorDash with (business, confirmed, from 2013) source

Tony Xu and Evan Moore: co-founded DoorDash with (business, confirmed, from 2013) source

Stanley Tang and Andy Fang: co-founded DoorDash with (business, confirmed, from 2013) source

About this map

People in Y Combinator

Relationships in Y Combinator