L. John Doerr (born June 29, 1951, in St. Louis, Missouri) is a prominent American venture capitalist, investor, and chairman at Kleiner Perkins Caufield & Byers (now Kleiner Perkins). He earned a Bachelor of Science in Electrical Engineering from Rice University (1973) and an MBA from Harvard Business School (1976). Early in his career, he worked at Intel Corporation, contributing to memory chip development, before joining Kleiner Perkins as a partner in 1980. Under his leadership, the firm became a Silicon Valley powerhouse, making transformative early-stage investments in companies including Netscape, Amazon, Google, and Twitter. Doerr is famous for these investments and has been instrumental in fostering innovation in technology and clean energy sectors. He has advised governments on climate technology initiatives and served on President Barack Obama's Economic Recovery Advisory Board (2009). A vocal advocate for climate action, he co-chaired the Obama administration's Climate Task Force, invested heavily in green technology, and authored 'Measure What Matters' (2017) and 'Speed & Scale: An Action Plan for Solving Our Climate Crisis Now' (2021). Forbes ranked him as the 40th richest person in tech in 2017 and the 146th richest in the world as of August 2023, with a net worth of $11.9 billion. Doerr is married to Ann Howland Doerr, a philanthropist; they have two children and reside in California. He has faced professional scrutiny, testifying in the 2012 gender discrimination lawsuit filed by Ellen Pao against Kleiner Perkins (dismissed in 2015). Politically aligned with Democratic causes, he has donated to candidates like Al Gore and Barack Obama and serves on boards including the Nature Conservancy. His professional network includes collaborations with figures like Doug Leone.