MIKE GREENFIELD

Co-Founder and CEO at Change Research

ActiveInvestor

Updated: Jan 22, 2026 ·

About

Mike Greenfield is an investor.

Recent News & Mentions

Oct 1, 2008FundingLinkedIn - Series D Jun 1, 2008FundingLinkedIn - Series D Jan 1, 2007FundingLinkedIn - Series C Sep 1, 2004FundingLinkedIn - Series B Oct 1, 2003FundingLinkedIn - Series A Apr 1, 2000FundingPayPal - Series C Jan 1, 2000FundingPayPal - Series B Jun 1, 1999FundingPayPal - Series A

Experience

Co-Founder and CEOCurrent

Change Research

Jan 2017 - Present

CEO and Co-Founder

Jan 2013 - Dec 2016

Growth Hacker-In-Residence

Jan 2012 - Dec 2013

CTO and Co-Founder

Jan 2007 - Dec 2012

Sr. Analytics Scientist

Jan 2004 - Dec 2007

PanelistCurrent

Goldsmith Prize

Jan 2002 - Present

Women's Squash Coach

Stanford University

Jan 2001 - Dec 2003

Founder and Stats GuyCurrent

TeamRankings.com

Jan 2000 - Present

Sr. Fraud R&D Scientist

Jan 2000 - Dec 2004

Statistical Software Engineer

Jan 2000 - Dec 2000

Hewlett-Packard

Jan 1999 - Dec 1999

Frequently Asked Questions

Who is Mike Greenfield?

Mike Greenfield is Co-Founder and CEO at Change Research.