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Mike Greenfield

Entrepreneur • Advisor San Francisco Bay Area, US

Data-loving entrepreneur. Occasional investor and adviser. Founded Circle of Moms + Team Rankings. Early analytics at PayPal + LinkedIn.

Data-loving entrepreneur. Occasional investor and adviser. Founded Circle of Moms + Team Rankings. Early analytics at PayPal + LinkedIn.

1 vouches

Primary Skillsets

  • Other Engineering
  • Marketing
  • Product
  • Growth
I have an idea that I'm exploring

Primary Cofounder Skillsets

  • • Other Engineering
  • • Marketing
  • • Product
  • • Growth

Involved In

Circle of Moms


500 Startups
Maven Ventures
Kiwi Crate


Angel Investor and Adviser Mike Greenfield March 2012 - present
Panelist Goldsmith Prize (Shorenstein Center at Harvard) 2002 - present
Founder and Stats Guy January 2000 - present
Growth Hacker-In-Residence 500 Startups July 2012 - January 2013
CTO and Co-Founder Circle of Moms June 2007 - March 2012
Sr. Analytics Scientist LinkedIn March 2004 - January 2007
Sr. Fraud R&D Scientist PayPal December 2000 - August 2004
Women's Squash Coach Stanford University September 2001 - June 2003
Statistical Software Engineer Xamplify March 2000 - December 2000
Intern Hewlett Packard Enterprise June 1999 - December 1999


Stanford Mathematical and Computational Science September 1996 - March 2000

Interested In

Cofounder With
  • • Engineering
  • • Product
  • • UI/Design
Markets of Interest
  • • Cloud Services
  • • Data & Analytics
  • • Education
  • • Enterprise Software
  • • Healthcare
  • • Local
  • • Media
  • • Mobile
  • • Productivity Tools
  • • Recruiting
  • • Small Businesses
  • • Travel

You Should Know About Me

Key Strengths

Viral marketing • A/B testing • Analytics • Mysql • data mining

Key Accomplishments

I (co-)founded Circle of Moms and Team Rankings. In both cases, I built the initial product.

I led the analytics team at LinkedIn early on, and built much of PayPal's initial fraud detection technology.

How I like to work with people As a Cofounder

I am good with data, and understand how online ecosystems work together.

I am good enough as a developer to build a decent product and scale things out, but I'm certainly not a world-class developer.

I enjoy product marketing as a means of making something work from a user/product perspective.

I'm a naturally intuitive person, but extremely responsive to data.

I have a good understanding of what it takes to make a startup successful.

Vouches Received

Vouches Given

Think Mike is awesome?
Vouch for them.

Maria Brandt
Founder, Self-employed - Internet Consulting. Previously Risk Manager for Checkout, Google. Stanford grad.
Mike is exceptional at solving problems, understanding the core strategy, and at creating and growing a business. He has proven to be a suc ... cessful entrepreneur, an analytical expert, and a growth hacker. He is also a great person to work with, or to work for, and I know since I worked closely with him at PayPal. He is extremely bright, he solved very difficult problems in the risk area at PayPal. He has a great sense of humor, and he is a very honest, ethical and sincere person. Finally,he has advised me on some concepts of my startup, with excellent leadership and advisory style.

Sabina Kroes
They're my advisor  •  Business Guru. Formerly: Founder Parendipity, Palm, Ericsson, AdInfuse. Obesed with product market fit, solving a real problem, user growth
Sabina is hard-working, passionate, and has a clear vision of what she wants to build.