Michael Grinich

Michael Grinich is best known as the founder and CEO of WorkOS, a developer platform that enables SaaS companies to add enterprise features — such as Single Sign-On (SSO), Directory Sync (SCIM), and audit logs — quickly and efficiently. WorkOS has become a widely adopted infrastructure layer for companies looking to sell into enterprise customers without building complex authentication and compliance features from scratch, positioning Grinich as a key figure in the B2B SaaS infrastructure space. Prior to founding WorkOS, Grinich held product leadership roles at Segment, the customer data platform that was later acquired by Twilio for $3.2 billion. His experience at Segment gave him firsthand exposure to the challenges of building developer-first products and scaling them to enterprise customers, which directly informed the founding thesis of WorkOS. He has also been involved in the broader developer tools ecosystem and has a background in engineering. While Michael Grinich is not primarily an AdTech figure, his work at WorkOS intersects with the AdTech and MarTech ecosystem insofar as many advertising technology and marketing technology platforms use WorkOS to power their enterprise authentication and identity management layers. His influence is primarily as a B2B infrastructure operator and product-focused founder rather than a traditional advertising technology specialist.

Last updated Jul 30, 2026 by ATDb automated enrichment · Connections updated Aug 3, 2026