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Phil Brennan

Founder

Founder at Cinder

Washington DC-Baltimore Area

FoundedCinder · YC

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About

Phil Brennan spent several years leading counterterrorism operations for the US government before joining Facebook in 2017, where he built out their community threat intelligence team. He later co-founded Cinder with Glen Wise, a former Facebook colleague.

Founder at CinderYC W22

Intro paths

YC

Phil went through Y Combinator (Winter 2022) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Brad Flora, Backing expeditions into the future — the partner who ran Cinder's batch and knows the company first-hand. YC profile ↗

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In turn, Phil can intro founders to Cinder's investors below.

Cinder's investors · 12

AccelPalo Alto · $500K – $100M checks · since 2026J2 VenturesBoston · since 2022M12 (Microsoft's Venture Fund)Seattle · $100K – $10M checks · since 2026MischiefSan Francisco · $1M – $5M checks · since 2022Mozilla Venturessince 2022OUTPOST VENTURESAlexandria · since 2026PioneerToronto, Ontario · since 2022PSP Growth FundChicago · $1M – $5M checks · since 2026Radical VenturesToronto · $1M – $25M checks · since 2026Vivek Sodera VenturesSeattle · since 2022Webb Investment NetworkSan Francisco · $500K – $750K checks · since 2022Y CombinatorSan Francisco · $500K checks · since 2022

Co-founders at Cinder

GWGlen Wise
Glen WiseFounder
BF
Brian FFounder
DCDeclan Cummings
Declan CummingsHead of Engineering
BF
Brian FishmanFounder
PB
Philip BrennanFounder

Frequently asked questions

Who is Phil Brennan?
Phil Brennan spent several years leading counterterrorism operations for the US government before joining Facebook in 2017, where he built out their community threat intelligence team. He later co-founded Cinder with Glen Wise, a former Facebook colleague.
Where does Phil Brennan work?
Phil Brennan is Founder of Cinder.
What companies did Phil Brennan found?
Phil Brennan founded Cinder.

Founder mafias

About this profile. Compiled from public sources — Cinder's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights