Ross Geiger

Ross Geiger is a go-to-market operator and startup founder, best known as the co-founder and President of Ciro, a Y Combinator (S22) AI sales-prospecting company. He holds a BA in Economics and East Asian Studies from Brown University, where he later reconnected with the friends who became his co-founders.

He began his career as a Senior Analyst at Altman Solon, a strategy consultancy focused on the technology, media, and telecom sectors, then moved into commercial roles at Catalant Technologies (an enterprise talent/marketplace software company), where he held client-strategy and enterprise account-management roles. He subsequently joined M33 Growth — a Boston-based growth-equity firm managing 700M+ that backs software, healthcare, and tech-enabled-services companies — where he worked in an operating capacity, rising from Associate to Director of GTM & Revenue Operations. In that role he implemented sales-and-marketing technologies across the firm and its portfolio, rather than sourcing traditional angel deals. His [hidden] email dates to this period.

Between M33 Growth and founding Ciro, he served as VP of Sales at YAPI, a Los Angeles–based dental-practice software company, building out its sales function. In 2022 he teamed with Richard Lee (CEO) and David Winer (CTO) — friends from Brown — to found Ciro, which builds an AI "prospecting agent" that finds prospects, researches buying signals, and drafts personalized outreach from within Slack.

In October 2022, Ciro raised a $3.8M seed round led by CRV, with Y Combinator and SV Angel participating (angels reportedly included founders of Flexport, BuildZoom, and Tegus). On July 8, 2026, Ciro was acquired by Reevo, which folded Ciro's prospecting technology into its AI-native "Revenue Operating System."

• Primary identity is operator/founder, not angel. Public sources classify Ross Geiger as a co-founder/operator; no verifiable record shows him running a personal angel portfolio. Treat the "angel investor / seed" tag with caution.
• M33 Growth (where he worked) thesis: growth-equity checks into previously bootstrapped, capital-efficient B2B software, healthcare, and tech-enabled-services businesses in the US and Canada, typically at Series A and beyond — the firm raised a $260M second fund for exactly this profile.
• His operating lens is GTM/revenue. Across YAPI, M33 Growth, and Ciro, his consistent expertise is sales, revenue operations, and go-to-market tooling — the areas where he adds the most value to a company.
• Comfort with sales-heavy, AI-for-GTM products. Ciro itself reflects what he believes in: automating outbound prospecting, research, and first-draft outreach for revenue teams.