Harshita Arora is General Partner at Y Combinator - the youngest in the organization's history - having dropped out of school at 15 in Saharanpur, India, taught herself to code, built and sold a crypto app featured by Apple at age 16, won India's Pradhan Mantri Rashtriya Bal Shakti Puraskar, moved to San Francisco on an O-1 visa, co-founded AtoB (the 'Stripe for Trucking' valued at ~$800M), and was named to Forbes 30 Under 30 before joining YC as a Visiting Partner in 2025 and ascending to General Partner in April 2026 at age 25.
David Lieb is a General Partner at Y Combinator who co-founded Bump - the app that let phones share data by physically bumping together, reaching 150 million users before being acquired by Google in 2013. After the acquisition, his team's unreleased photo-sharing project became Google Photos, which Lieb led as Senior Director for nine years until it reached over 1 billion users. Now at YC, he mentors early-stage founders drawing on his rare trifecta of experience: consumer hit, big-tech product leadership, and venture capital.
Pete Koomen co-founded Optimizely during Y Combinator's Winter 2010 batch, building it from a pivoted idea in week two of YC into a $100M+ ARR experimentation platform before its 2020 acquisition. A former Google product manager who helped launch Google App Engine, Pete brought engineering rigor and scientific method obsession to the messy world of product decisions. He co-authored the field-defining book 'A/B Testing: The Most Powerful Way to Turn Clicks Into Customers,' and now serves as a Group Partner at Y Combinator, where he advises early-stage founders on enterprise sales, AI product design, and the art of building companies that actually figure out what works.
Gustaf Alstromer is a General Partner at Y Combinator, the world's most prestigious startup accelerator. A Swedish-born, San Francisco-based operator-turned-investor, he spent five years scaling Airbnb's growth team from 3 to 100+ people before joining YC in 2016. At YC he has mentored 600+ startups with a combined valuation of $118B+, reviewed 9,000+ applications, and become one of Silicon Valley's most cited voices on growth, experimentation, and climate tech entrepreneurship.