# Cyrus Massoumi

> Cyrus Massoumi is an American entrepreneur and investor who co-founded Zocdoc and led it as founding CEO from 2007 to 2015. He is founder and CEO of Dr. B and a founder and managing partner of humbition. His public writing and interviews discuss early hiring, the failure of his first startup, and the value of operator experience in investing.

- **Role:** Founder and CEO at Dr. B; Founder and Managing Partner at humbition
- **Organizations:** Zocdoc, Dr. B, humbition, Shadow, OneSizeTooSmall, McKinsey & Company, Trilogy Software
- **Nationality:** American
- **Education:** Secondary education, Phillips Academy, Bachelor of Science with honors, The Wharton School, University of Pennsylvania, MBA, Columbia Business School
- **Known for:** Co-founded Zocdoc and led the company for eight years., Co-founded humbition with Slava Rubin; its inaugural fund totaled $30 million., Received Columbia’s Heffernan Award for Outstanding Service.

## Career timeline

- **1998** — Graduated from Wharton and joined Trilogy Software in Austin, where he worked alongside future co-founder Nick Ganju.
- **1999** — Founded OneSizeTooSmall to improve e-commerce returns.
- **2001** — OneSizeTooSmall closed; subsequently spent six months backpacking through China.
- **2003** — Earned a Columbia MBA and subsequently worked at McKinsey, where he met Oliver Kharraz.
- **2007** — Co-founded Zocdoc with Nick Ganju and Oliver Kharraz; became founding CEO.
- **2015** — Zocdoc CEO tenure ended following a board leadership review.
- **2018** — humbition launched its inaugural $30 million fund with Slava Rubin.
- **2020** — Discussed Shadow, philanthropy, and humbition in an Unleashed podcast interview.
- **2021** — Founded Dr. B; Shadow closed in October.
- **2026** — Delivered distinguished speaker remarks at Columbia Business School’s MBA and EMBA recognition ceremony.

## Achievements

- Co-founded Zocdoc and led the company for eight years.
- Co-founded humbition with Slava Rubin; its inaugural fund totaled $30 million.
- Received Columbia’s Heffernan Award for Outstanding Service.
- Recognized on Fortune and Crain’s 40 Under 40 lists.
- Included in Fast Company’s 2012 Most Creative People in Business list at number 57.
- Distinguished speaker for Columbia Business School’s 2026 MBA and EMBA ceremony.

## Latest updates

- **2026-05** — Spoke at Columbia Business School’s May 16 MBA and EMBA recognition ceremony; a May 28 university article described his revised formula for success.
- **2026-04** — A New York appeals court affirmed dismissal of his fraud complaint concerning his removal as Zocdoc CEO.

## Links

- Website: https://www.cyrusmassoumi.com/
- LinkedIn: https://www.linkedin.com/in/cyrus-massoumi-58330b/
- Twitter/X: https://twitter.com/cyrusmassoumi
- Instagram: https://www.instagram.com/cyrusmassoumi/

---

Profile page: https://yespress.io/cyrus-massoumi
Published by YesPress — https://yespress.io
Last updated: 2026-10-08