Fundraising Fox
🦊/People
Sign in

Mattan Griffel

Founder

Founder at Ophelia · Founder/CEO at One Month

Brooklyn, New York, United States

FoundedOne Month · YCOphelia · YC

30 Under 30 2015 · Education

Find your path to Mattan

1,943 people in our graph share verified history with Mattan — schools, employers, funds. One of them is your warm intro.

Alex ChachavaunlockedMattan: together at YPO (2021–2024)
×9Mattan: together at Y Combinator
×2Mattan: together at Columbia Business School

About

Mattan Griffel studied philosophy and finance at New York University and co-founded Ophelia, a Y Combinator-backed opioid recovery platform. He is faculty at Columbia Business School and an Innovation Fellow at the Lang Center for Entrepreneurship.

Likely email· guessed from name + firm domain, not firm-published

Founder at OpheliaYC W20

Intro paths

YC

Mattan went through Y Combinator (Winter 2020) — any YC alum in your network can reach them through the YC community.

→

In turn, Mattan can intro founders to Ophelia's investors below.

Ophelia's investors · 9

Four Acres CapitalNew York · $50K – $100K checksGeneral CatalystSan Francisco · $30M checks · since 2021Good FriendsSan Francisco · $250K – $1M checks · since 2021Interplay VenturesNew York · since 2021Interplay Ventures Early Stage Management LlcNew York · $1M checksMenlo VenturesSan Francisco · $1M – $20M checks · since 2021Refactor CapitalBurlingame · $1M – $2M checks · since 2021Tiger Global ManagementNew York · $1M – $100M checks · since 2021Y CombinatorSan Francisco · $500K checks · since 2020

Co-founders at Ophelia

ZGZack Gray
Zack GrayFounder

Founder/CEO at One MonthYC S13

Intro paths

YC

Mattan went through Y Combinator (Summer 2013) — any YC alum in your network can reach them through the YC community.

→

In turn, Mattan can intro founders to One Month's investors below.

One Month's investors · 2

FundersClubSan Francisco · $250K – $5M checksY CombinatorSan Francisco · $500K checks · since 2013

Co-founders at One Month

CCChris Castiglione
Chris CastiglioneFounder

Experience

  1. Columbia Business SchoolAssistant Professor of Professional Practicecurrent2025 — presentNew York, United States
  2. Columbia Business SchoolAdjunct Assistant Professor of Business2016 — 2025Greater New York City Area
  3. Eugene M. Lang Entrepreneurship Center at Columbia Business SchoolLang Entrepreneurship Coachcurrent2023 — present
  4. OpheliaBoard Observercurrent2023 — presentNew York, United States
  5. OpheliaCo-Founder, President, & COO2019 — 2023New York, United States
  6. YPOMembercurrent2021 — present
  7. InvisiblePartner, SVP2024 — 2025
  8. InvisibleAdvisor2023 — 2024
  9. Eugene M. Lang Entrepreneurship Center at Columbia Business SchoolLang Center Innovation Fellow2019 — 2021New York, United States
  10. One MonthChairman2017 — 2021Greater New York City Area
  11. One MonthCo-Founder & CEO2013 — 2017Greater New York City Area
  12. SandboxNYC Ambassador2010 — 2020Greater New York City Area
  13. GrowHackPartner2012 — 2016Greater New York City Area
  14. The Front LabsCEO & Founder2011 — 2013Greater New York City Area
  15. appssavvyHead of Marketing2010 — 2011Greater New York City Area

Skills & more

Ruby on Rails4Fundraising3Leadership Development Coaching3Executive Coaching1Healthcare1Social Media99Marketing84Advertising17Philosophy6Start-ups99Digital Media28Digital Strategy33
+12 moreDigital MarketingSocial Media MarketingEntrepreneurshipOnline AdvertisingAnalyticsMarketing StrategyWeb AnalyticsBusiness DevelopmentProduct DevelopmentLeadershipStrategyStrategic Planning

Languages English · German

  • One Month Rails — One Month

From Mattan's professional profile.

Frequently asked questions

Who is Mattan Griffel?
Mattan Griffel studied philosophy and finance at New York University and co-founded Ophelia, a Y Combinator-backed opioid recovery platform. He is faculty at Columbia Business School and an Innovation Fellow at the Lang Center for Entrepreneurship.
Where does Mattan Griffel work?
Mattan Griffel is Founder/CEO of One Month and Founder at Ophelia.
What companies did Mattan Griffel found?
Mattan Griffel founded One Month, Ophelia.
Where did Mattan Griffel go to school?
Mattan Griffel studied at Y Combinator (Summer 2013, Winter 2020); Columbia Business School (Master of Business Administration (MBA)); NYU Stern School of Business (Bachelor of Science (BS), Double Major: Finance & Philosophy).

Founder mafias

Same school

Shared employers

Also worked at Eugene M. Lang Entrepreneurship Center at Columbia Business School1

Brian BergerAdvisor at Bridge Venture Fund