Investment Team

Joshua Biopic High Res

Joshua B Siegel
General Partner
New York, NY

As General Partner – New York, Joshua oversees the day to day activities and operations of Rubicon including evaluating early stage technology companies seeking funding, assisting current portfolio companies… [More]


Andrew C Romans
General Partner
San Francisco, CA

As General Partner – San Francisco, Andrew focuses on sourcing new investment opportunities, closing investments into startups, raising LP Capital and helping portfolio companies succeed .… [More]

Mat Kaliski
New York, NY

As Associate – New York, Mat focuses on sourcing and evaluating early stage companies, conducts diligence on potential investments and supports Rubicon’s portfolio companies… [More]

Kaoru Nakahama
Relationship Manager Japan
Tokyo, Japan

As Relationship Manager – Japan, Kaoru focuses on Investor Relations with Japanese family offices, conglomerates, corporations and high net worth individuals… [More]

Venture Partners

Fredrik Bernsel
Venture Partner
London, UK

  • EMEA Director at LinkedIn, leading team spanning 20+ markets. Part of the LinkedIn EMEA LMS Leadership team.
  • Previously VP Online at IDG Sweden, including investments for IDG Ventures in the Nordics.
  • Previously Editor-in-Chief and Publisher, IT and biotech.
  • MBA from INSEAD.

Don Carlson

Donald Carlson
Venture Partner
New York, NY

  • Chief of Staff, Legal Department, Goldman Sachs
  • Managing Director, New Business Development, Corporate Executive Board
  • Founding Partner, The Forefront Law Group
  • Williams College, Harvard Law

Erik Doyle

Eric Doyle
Venture Partner
Silicon Valley, CA

  • Managing Director, Jones Lang LaSalle
  • President, Cornish & Carey Commercial
  • Executive Vice President, CB Richard Ellis
  • Founder of real estate private equity fund
  • Stanford University


Igor Jablokov
Venture Partner
Raleigh, NC

  • EIR at Blackstone NC
  • Former CEO of Yap, VC backed cloud computing company, acquired by
  • 10 years at IBM, Program Director at Pervasive Computing
  • Serves on advisory boards at Pennsylvania State University & University of North Carolina
  • LP at DreamIt Ventures
  • Eisenhower Fellow & Truman National Security Fellow 

Derek P

Derek Proudian
Venture Partner
Silicon Valley, CA

  • General Partner, Mohr Davidow Ventures
  • Venture Partner, Morgan Stanley Venture Partners
  • CEO, Zip2 (Elon Musk’s 1st company), sold for $307m cash
  • CEO, LensVektor, raised $37.5m VC funding
  • Stanford University, MBA, MS, BS, BA 

Fabio Rup

Fabio Rupp
Venture Partner
Silicon Valley CA

  • Chairman, Swiss San Francisco Chamber of Commerce

  • Professor of Venture Capital, University of Santa Clara
  • Advisor to VC funds & VC-backed startups: Ecosystem Ventures, Natural Ma, Neurotune, Hera Biomedical, Prionics, Hyseq/Nuvelo
  • Professor, Johns Hopkins University School of Medicine 

Greg Schmergel
Venture Partner
Boston, MA

  • Cofounder and CEO, Nantero, Inc.

  • Raised over $90m in VC funding from Globespan, CRV, DFJ, etc.

  • Former SVP, Strategy,

  • Former Founder & CEO,

  • Board Member, Massachusetts Technology Leadership Council

  • Winner, Ernst & Young Entrepreneur of the Year, New England, Emerging Technology, 2006

  • Judge in business plan competitions such as MassChallenge, MIT Business Plan Competition

  • MBA, Harvard Business School


Jói Sigurðsson
Venture Partner
Iceland and Silicon Valley, CA

  • Partner, Investa angel fund
  • Senior Staff Software Engineer at Google (9+ years), Tech Lead for teams in Google Desktop, Toolbar and Chrome
  • Senior Engineer at GreenBorder, acquired by Google
  • Co-founder, CTO & early developer at multiple tech startups


Larry Stambaugh
Venture Partner
San Diego, CA

  • CEO of multiple technology companies, raised over $500 million, including private equity, IPOs in U.S. and E.U., and secondary follow-on and PIPE transactions while growing market capitalizations from $15 million to $1.7 billion
  • Recognized expert in Board Governance