Fundraising Fox

Daniel Martinez

Founder

Founder & Product at Callbook AI

San Francisco, California, United States

FoundedCallbook AI · YC

Find your path to Daniel

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

Diego AvellanedaunlockedDaniel: together at Callbook AI

About

Founder and product lead at Callbook AI, previously CTO there and Chief Product Officer at Treble (YC S19). Has spent over five years leading B2B products.

Founder & Product at Callbook AIYC S26

Intro paths

YC

Daniel went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Jon Xu, General Partner at Y Combinator — the partner who ran Callbook AI's batch and knows the company first-hand. YC profile ↗

→

In turn, Daniel can intro founders to Callbook AI's investors below.

Callbook AI's investors · 2

Vela PartnersSan Francisco · $100K – $500K checksY CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Callbook AI

DADiego Avellaneda
Diego AvellanedaFounder

Experience

  1. StandSenior Machine Learning Engineercurrent2025 — presentSan Francisco, CA
  2. NASA Ames Research CenterMachine Learning and Aerospace Engineer2019 — 2024NASA Ames Research Center, Mountain View, CA
  3. U.S. Army Engineer Research and Development Center (ERDC)Research Mechanical Engineer & Data Scientist2017 — 2019
  4. University of Puerto Rico-MayaguezGraduate Research And Teaching Assistant2015 — 2017

Skills & more

High Performance Computing (HPC)2Deep Learning2Computational Fluid Dynamics (CFD)1Machine Learning1AutomationNumerical Analysis

From Daniel's professional profile.

Frequently asked questions

Who is Daniel Martinez?
Founder and product lead at Callbook AI, previously CTO there and Chief Product Officer at Treble (YC S19). Has spent over five years leading B2B products.
Where does Daniel Martinez work?
Daniel Martinez is Founder & Product of Callbook AI.
What companies did Daniel Martinez found?
Daniel Martinez founded Callbook AI.
Where did Daniel Martinez go to school?
Daniel Martinez studied at University of Puerto Rico-Mayaguez (Bachelor's degree, Mechanical Engineering); University of Puerto Rico-Mayaguez (Master's degree).

Founder mafias

Y Combinator mafia10,230

Also came through, then founded or led a company.

Sam AltmanPresidentFounded Tools for Humanity +3Garry TanPresident & CEOFounded Y Combinator +1Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianPartnerFounded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded Paradigm +1

+ 10,223 more

Same school

Also attended University of Puerto Rico-Mayaguez9

Sue SiegelHealth Moonshot Impact Board at StartUp HealthCarlos MartinezBoard Member at North Texas Angel NetworkRamphis CastroGeneral Partner at ScienceVestEric SanchezFounder/CEO at REVLEmmanuel OquendoFounder/| CEO at BrainHiNelson BermudezExecutive Officer at PBS Biotech

+ 3 more

Shared employers

Also worked at Stand4

Aidan Madigan-CurtisPartner at Eclipse VenturesSam ShankInvestor at Andreessen HorowitzNeeraj HablaniPartner at Neotribe VenturesDan PrestonExecutive Officer, Director at Metromile

Also worked at NASA Ames Research Center76

Lindsey YeePrincipal at Starbridge Venture Capital LlcMelissa LokugamageSenior Venture Associate at 82VSGeetha DholakiaPortfolio Program Director at TDK VenturesRyan AbronskiSenior Associate at Morgan Creek CapitalDipty DesaiVenture Partner at Elevate CapitalTed TabaccoOperating Partner at SAV (Scale Asia Ventures)

+ 70 more

Also worked at U.S. Army Engineer Research and Development Center (ERDC)2

Rob AlbrittonManaging Director, Technology and Innovation at Enlightenment CapitalJosh HumberstonFounder & CEO at Coastal Measures

Also worked at University of Puerto Rico-Mayaguez1

William MolinaExecutive Officer at University of Phoenix