L. John Doerr (born June 29, 1951) is an American investor and venture capitalist at Kleiner Perkins in Menlo Park, California.

[3] Doerr is the author of Measure What Matters, a book about goal-setting, and Speed & Scale: An Action Plan for Solving Our Climate Crisis Now.

"[10] He joined Kleiner Perkins that year, and since then has directed the distribution of venture capital funding to technology companies including Compaq, Netscape, Symantec, Sun Microsystems, drugstore.com, Amazon.com, Intuit, Macromedia, and Google.

[11] Doerr has backed entrepreneurs, including Larry Page, Sergey Brin, and Eric Schmidt of Google; Jeff Bezos of Amazon.com; and Scott Cook and Bill Campbell of Intuit.

[12] Doerr advocates innovation in clean energy technologies to combat climate change and has written and testified on the topic.

In a 2007 TED conference, he cited his daughter's remark, "your generation created this problem, you better fix it", as a call to fight global warming.

[13] In 2008, he announced with Steve Jobs the Kleiner Perkins $100 million iFund, declaring the iPhone "more important than the personal computer" because "it knows who you are" and "where you are."

[26] In August 2010, they signed the Giving Pledge, a campaign set up by the Bill & Melinda Gates Foundation and Warren Buffett to get ultra-high-net-worth individuals to donate their fortunes to charitable causes within their lifetime.

[39] Along with Mark Zuckerberg and Reid Hoffman, John Doerr was a co-founder of FWD.us, a lobbying group focused on immigration reform, improvements in education, and scientific research.