Our Team

Madrone's team includes some of the best talent from the world's leading alternative asset management and technology companies like BlackRock, Microsoft, S.A.C. Capital, JP Morgan, Demandbase, and Kabbage.

Madrone is hiring. Come join us.

Michael Siminoff

Founder & CEO

Believes data improves decision making, removes bias, and supports innovation. Thinks building a great team is a skill worth perfecting. Learned at JP Morgan S.A.C. Capital, and Guggenheim Partners. Passionate about exploring the world's mountains and oceans with family. University of Michigan alum. Go Blue!

Scott Breffle

Software Engineer

Scott enjoys wrangling data into manageable form. Formerly of Thomson Reuters, he has been applying software solutions to financial data for over 10 years at both startups and large companies. Graduate of Cal Poly Pomona and Harvard University. Likes tinkering in the kitchen and following everything aviation. A licensed private pilot.

Geoff Evason

Software Engineer

Loves making complex software and interfaces easy to understand and use.

Justin Gordon

Software Engineer

Justin has been passionately writing software since 1985, focusing on Java since 1996 at several startups and with Ruby on Rails since 2011. He loves writing and teaching about modern web development. He has an MBA from Cal Berkeley and an undergraduate degree from Harvard.

Colin Alexander

Quantitative Researcher

Markets and Risk Research background at Man Group and UBS coupled with a real interest in coding in Python. Enjoys exploring the SF Presidio with his dog Bailey. Cal Berkeley undergrad and London Business School MBA.

Marco Sandoval

Data Engineer

Marco has a strong passion for understanding finance and providing scaled solutions to complex problems. Developing fund accounting skills at Passport Capital and programming skills at Cerebellum Capital he brings a unique skill set to the team. He enjoys soccer and a good hike in the beautiful bay area.

Serena Ho, CFA, CAIA

Business Development

Consultative sales expert. Relationships builder. Certifications collector. Serious travel addict. Developed and cultivated partnerships with institutional investors at BlackRock/BGI. Business Admin at UC Berkeley (Haas).


  • Simon Yoo: Managing Partner, Green Visor Capital and former CFO of Kabbage
  • Chris Golec, CEO, Demandbase
  • David Korus, Portfolio Manager at Owenoke & Kingdon, former Board Member at FactSet
  • Dr. Anton Poutchkov, Risk Reseach at Alyeska, former Risk Researcher at Axioma, DB Prop, and Barra
  • Benn Eifert, PhD, Derivatives Portfolio Manager at Mariner and Overland
  • Al Goduti, CFA: Co-Head of US Pension at Blackrock, Board member of CFA Society of San Francisco