Sierra
FeaturedAI agents for every customer conversation.
Founded in 2023 by Bret Taylor and Clay Bavor in San Francisco, Sierra was built to bring enterprise-grade conversational AI agents to every customer-facing business. Bret Taylor, former co-CEO of Salesforce and Chairman of OpenAI's board, and Clay Bavor, former head of Google Labs and Google VR, combined their experience to create an AI platform that can handle real customer interactions with nuance, empathy, and accuracy. This week on May 4, 2026, Sierra raised a massive $950 million Series E led by Tiger Global and GV at a $15.8 billion post-money valuation — nearly doubling its previous valuation and signaling explosive enterprise demand for AI customer service agents.
Active Founders
Bret Taylor
Founder / Co-CEO
Bret Taylor is the co-founder and Co-CEO of Sierra. One of Silicon Valley's most respected leaders, Bret co-created Google Maps, served as CTO of Facebook, co-CEO of Salesforce, and Chairman of OpenAI's board. His rare combination of deep technical skill and enterprise business experience makes him uniquely positioned to build the leading AI platform for business customer interactions. His track record and network have helped Sierra attract top-tier enterprise clients and investors with remarkable speed.
Clay Bavor
Founder / Co-CEO
Clay Bavor is the co-founder and Co-CEO of Sierra. He spent over 17 years at Google, eventually leading Google Labs and the company's ambitious virtual and augmented reality efforts. Clay's experience in building new product categories from scratch and his deep understanding of human-computer interaction directly informs Sierra's approach to designing AI agents that feel natural, helpful, and trustworthy in real customer conversations.
Sierra
