Top 50 CleanTech Angel Investors in United States in September 2025

David E. Weekly is the Head of The Capital One Lab of Capital One. He previously worked at Medcorder as a Founder and CEO. David E. Weekly attended Stanford University.

Kathy Fields is the Co-Founder of Alchemee. Kathy Fields attended Taylor University.

Justin Hamilton is Founder, CEO at Clutterbot.

Dr Rand Hindi is an entrepreneur and investor in 50+ deeptech and web3 companies. He is the CEO at Zama, a homomorphic encryption startup. Rand started coding at the age of 10, created a social network at 14, and started his PhD at 21. He then created Snips, the first private-by-design voice assistant, which was acquired by Sonos. He was electedan MIT TR35, a Forbes “30 under 30”, and was a lecturer at Sciences Po in Paris as well as a member of the French Digital Council.He holds a BSc in Computer Science and a PhD in Bioinformatics from University College London (UCL).

Bill Gates is the Co-chair of Bill and Melinda Gates Foundation. He attended Harvard University.

Elon Musk has co-founded companies such as SpaceX and tunneling startup The Boring Company, and has played served as CEO of Tesla Motors since 2008. He previously worked as a sales manager at many enterprise LLCs. Elon Musk attended the University of Pennsylvania and received bachelor's degrees in economics and physics.

Bill Gates is the Co-chair of Bill and Melinda Gates Foundation. He attended Harvard University.

Venture Capitalist, Managing Partner, Chief Technology Officer

Ashley Mayer is the Operating Council at Mixing Board . Ashley Mayer attended Georgetown University.

Warren Buffet is a businessman and investor. He was born Warren Edward Buffett on August 30,1930, in Omaha, Nebraska. Buffett's father Howard worked as stockbroker and served as U.S. Congressman. His mother, Leila Stahl Buffett, was a homemaker. Buffett was the second of three children and the only boy.Buffett demonstrated a knack forfinancial and business matters early on in his childhood. Friends and acquaintances have said the young boy was a mathematical prodigy, and was able to add large columns of numbers in his head-a talent he still occasionally shows off to friends and business associates.Warren often visited his father's stockbrokerage shop as a child, and chalked in the stock prices on the blackboard in the office. At 11 years old he made his first investment; he bought three shares of Cities Service Preferred at $38 per share. The stock quickly dropped to only $27, but Buffett held on tenaciously until they reached $40. He sold his shares at a small profit, but regretted the decision when Cities Service shot up to nearly $200 a share. He later cited this experience as an early lesson in patience in investing.By the age of 13, Buffett was running his own businesses as a paperboy and selling his own horseracing tip sheet. That same year, he filed his first tax return, claiming his bike as a $35 tax deduction.In 1942, Buffett's father was elected to the U.S. House of Representatives, and his family moved to Fredricksburg, Virginia, to be closer to the congressman's new post. Buffett attended Woodrow Wilson High School in Washington, D.C., where he continued plotting new ways to make money. During his high school tenure, he and a friend purchased a used pinball machine for $25. They installed it in a Washington, D.C. barbershop and, within a few months, the profits of the machine allowed Buffett and his friend to buy other machines. Buffett owned three machines in three different locations before he sold the business to a War Veteran for $1,200.Buffett enrolled at the University of Pennsylvania at the age of 16 to study business. He stayed two years, moved to the University of Nebraska to finish up his degree, and emerged from college at age 20 with nearly $10,000 from his childhood businesses.Buffett attended Columbia University for his advanced degree and in 1956, shortly after graduation, he formed the firm Buffett Partnership in his hometown of Omaha. His investment successes, particularly in buying undervalued companies whose stocks shortly began to rise, made him extremely rich and gained him the sobriquet, "Oracle of Omaha." Other notable career succeses include helping rescue Salomon Brothers from corporate raiders (1987) and taking charge of the New York City house (1992) in the wake of an insider trading scandal.In June 2006, Buffett made an announcement that he would be giving his entire fortune away to charity, committing 85 percent of it to the Bill and Melinda Gates Foundation. This donation became the largest act of charitable giving in United States history.The majority of Buffett's considerable fortune was amassed through Berkshire Hathaway, a company for which he is the largest shareholder and CEO. Ranked as Forbes' wealthiest man in 2008, his net worth is estimated at more than $62 billion.Source:

Edward Kim

Jeffrey Preston Bezos is the Founder of Blue Origin. He previously worked at Cashican People LLC as an Investor. Jeff Bezos attended Princeton University.

Healthcare M&A investment banker at Juniper Advisory. Previously Morgan Stanley & Northwestern University - Kellogg School of Management.

Luigi Bajetti is the managing partner and founder of Lombardstreet Ventures, an early-stage venture capital firm in Menlo Park, California.Luigi is a serial entrepreneur with over 25 years of experience in the tech and internet industries, with a wealth of knowledge and expertise in building and scaling startups.As a full-time investor since2013, he has been leveraging his experience and insights to identify and support the next generation of Silicon Valley founders. With a passion for backing game-changing technologies and a talent for spotting emerging trends, Luigi has a proven track record of success in identifying groundbreaking startups. He has invested almost always at the earliest possible stage of seed in 20+ US startups valued at over $30 billion combined, including 9 that have since become unicorns.

Mark Cuban is the founder of Fireside, Chairman and Founding Partner of AXS TV, and the Owner of Dallas Mavericks. He previously worked at Broadcast.com as a Co-Founder. Mark Cuban attended the Indiana University Bloomington.

Eugene Goldberg

Elizabeth Cutler and her partner Julie Rice were determined to find an alternative to the fitness routines that felt like work. In 2006, they created SoulCycle, a workout that combines inspirational coaching with high-energy music and a full body workout on the bike. Today, riders of all ages have responded to the SoulCycle cardio party withover 60,000 people riding at SoulCycle every week. Elizabeth was honored as one of Goldman Sachs' 100 Builders + Innovators in 2013 and 2014, and SoulCycle was voted one of the World's Top 10 Most Innovative Companies in Fitness of 2013 by Fast Company.In 2015, Elizabeth was voted one of Fast Company's Most Creative People in Business.

Marc Tarpe is based out of Redwood City, California and serves as the Venture Partner of Spero Ventures and also serves as the Board of Director of Wattch. Marc previously served as Co-Founder of Tesla. Marc attended the University of California, Berkeley.

Luke Kupersmith - President & CEO @ Lojistic

Vernon Davis - Advisor @ SportsCastr

Jon Oringer is the founder and chairman of Shutterstock.

Global tech startup CXO and board director. Passionate leader who builds and motivates teams to achieve audacious goals with urgency and purpose. Seasoned entrepreneur with USD $350M+ of exits and a track record of driving disruptive tech from launch to rapid scale both in startups and within large organizations. Mentor and force multiplier whosementees have created USD $100B+ enterprise value. Born at 337.10 PPM.

Mark Cuban is the founder of Fireside, Chairman and Founding Partner of AXS TV, and the Owner of Dallas Mavericks. He previously worked at Broadcast.com as a Co-Founder. Mark Cuban attended the Indiana University Bloomington.

Nicolaj Reffstrup is the Founding Partner of Look Up Ventures. He previously worked at Lifestyle and Design Cluster as a Board Member.Nicolaj Reffstrup attended Copenhagen Business School.

Eminem was born Marshall Bruce Mathers III in St. Joseph, Missouri, to Deborah R. (Nelson) and Marshall Bruce Mathers, Jr., who were in a band together, Daddy Warbucks. He is of English, as well as some German, Scottish, and Swiss-German, ancestry. Marshall spent his early childhood being shoved back and forth from Kansas City and Detroit. Hesettled on the Eastside of Detroit when he was 12. Switching schools every two to three months made it difficult to make friends, graduate and to stay out of trouble. Marshall attended Lincoln High School in Warren, Michigan, 1986-1989.Being a rap fan for most of his life, Marshall began rapping at the early age of 4. Rhyming words together, battling schoolmates in the lunchroom brought joy to what was otherwise a painful existence. At the age of 14, he began to get very serious about his rapping but it wasn't until he was 17 that he actually made a name for himself, becoming M&M, which he would later respell as "Eminem". Being rejected by most fellow rappers because of his race, Marshall grew an anger that flows through his music to this day. After failing the 9th grade for three times in a row, he quit school, but has remarked that he does not consider himself stupid and does not advise that people should follow his example. He says that it just wasn't for him. Forcing himself on radio shows, freestyle battles, Marshall threw himself head first into the rap game, where he was swallowed up most of the time. His very first album was titled "Infinite" and, while the album sold less than a thousand copies, it was the gearing up stages for the rapper who became a millionaire. It was then that his daughter, Hailie Jade Scott, was born on December 25th of 1995 with long time girlfriend Kim Scott.Having nothing to lose at all, flat broke and not knowing where he would be living the next week, Marshall set out to rant about life in general, the set quickly caught the ear of hip-hop's difficult-to-please underground. What came out of this was the Slim Shady EP, the early work for the later Dr. Dre revised Slim Shady LP. Down to nearly his last dime, he went into the 1997 Rap Olympics in Los Angeles, basically hoping to win the $1,500 cash prize which he badly needed. After battling for an hour and throwing back every race diss thrown at him, Marshall made it to second place losing in a slip up. Furious that he had lost, Marshall didn't even notice that he had been spotted. In the crowd were a few producers from Interscope, and they were handed a copy of the "Infinite" tape by way of a demo.Dr. Dre got to hear it and eventually tracked him down. The two instantly hit it off, recording four songs in their first six hours of working - three which made it to his first LP. After the album was finished, Dr. Dre asked Marshall to come work with him on his new album. He helped produce several tracks and was on the best songs of the album. Now officially making it, Marshall and Dre set to make his second LP. The album became the Marshall Mathers LP and won 3 Grammies and was the first rap album ever to be nominated "Album of the Year", selling more than 8 million records in the United States alone. He also stunned critics when he shot down all homophobic remarks by performing "Stan" with Elton John. Eminem made a movie, 8 Mile (2002). Though 2001 was a rough year for the rapper, being charged with weapon offenses, divorcing his wife, and almost going to prison, Marshall has explained his life in one word: "Claimer".

Kim Kardashian is the current Chief Taste Consultant of Beyond Meat. She previously worked at Glu Mobile as a Member of the Board of Directors.

Ivanka Trump

Mark Heising is a Managing Director of Medley Partners in San Francisco, CA. He founded the firm in 2004.Previously he was the President of VLSI Cores, which designs and licenses cryptographic integrated circuits.He holds six U.S. Patents in cryptography, compression and data communications.Mark serves as a director for Lam Aviation,Sion Power, Solexant and Tabula. On the non-profit side, Mark currently serves on the Board of Directors of the Bipartisan Policy Center and the Environmental Defense Fund.Mark earned a BS in Physics and a MS in Electrical Engineering and Computer Sciences from the University of California at Berkeley.

Khloé Kardashian

He is the Founder of Sustainable Energy and Agriculture Technology (SEAT, LLC) and AGR Health. He attended Cornell University, McGill University, and the Indian Institute of Technology, Kharagpur.

Dave Peacock is the former President of the Anheuser-Busch InBev subsidiary, Anheuser-Busch. He succeeded August Busch IV in 2008 after the acquisition of Anheuser-Busch was completed by InBev on November 18, 2008.

Mr. Mohit Goel is the CEO of one of India’s leading real estate firms – Omaxe Ltd. This second generation entrepreneur leveraged his sharp business acumen to bring about structural changes in Omaxe to essentially turn around the company at a time when the real estate sector had no traction and a tepid demand. Mohit is detail oriented and a sticklerfor punctuality.

Tim Schumacher is a Managing General Partner at World Fund. Tim previously worked at Sedo.com as a Member Board Of Directors. He attended University of Cologne and Stockholm School of Economics.Tim Schumacher Co-Founded and was the longtime CEO of the publicly traded company Sedo AG, which currently has revenues of 130m euros per year andmaintains approximately 350 employees. Since 2012 he has dedicated his professional career to the German startup scene, acting both as a business angel and mentor for young companies with economic potential. His current startups, among many others, are Eyeo/Adblock Plus, Aklamio, Hitfox and Ecosia.

Sylvain Theveniaud - Managing Director @ Allianz Accelerator

Travis Rush is currently the CEO and Co-founder of Reperio Health, a Portland, Ore.-based tech company that offers an app-connected, at-home health and wellness screening solution. Reperio capitalizes on the momentum around home-based health testing, preventive healthcare, the rise of the telehealth industry and the consumerism of medicine. Priorto Reperio, Rush founded Sightbox, an all-inclusive vision care solution. In 2017, Sightbox was acquired by Johnson & Johnson. Rush began his technology career in 1997, when he bootstrapped the launch of his web application development company, Rushweb Solutions, which created and supported online website, e-commerce, hosting and email solutions for thousands of small businesses across the U.S. and Canada. Rush is also an accomplished producer and musician; you can find his music on most streaming music platforms.

Sumant Singhal

Dr. Franklin is the CEO and Managing Director of WVV Capital. He holds a Ph.D. from the Computer Science Department at Carnegie Mellon University and degrees in Computer Science, Mathematics, and Business from the University of Wisconsin-Madison. He is the recipient of the 2012 Allen Newell Award for Research Excellence, 2009 SOSP Best PaperAward, 2005 USENIX Security Best Paper Award, Department of Homeland Security Fellowship, and NSF Graduate Research Fellowship.

Jane Woodward, managing partner of WovenEarth Ventures and adjunct professor at Stanford University.

Dr. Garry Rayant is the Funder at Dear Doctor

Peter Attia

Robin is the CEO of Helix. Before joining Helix, Robin held various positions at Under Armour. Prior to that, he co-founded and served as the chief executive officer of MapMyFitness. Robin holds a master's degree in finance from the University of Colorado at Denver.

Curtis Jackson is professionally known as "50 cent" is the Founder and CEO of SMS Audio. He began as music chart dominance for the rap music phenomenon, has quickly transformed into success in corporate America. 50 Cent is a multi-tiered business mogul to be reckoned with. Recognized as one of the most talented and prolific music artistsof his time, 50 Cent has managed to leverage his star power into record-breaking brand extensions encompassing a broad spectrum of businesses including music ownership, artist management, film production, footwear and apparel, fragrance, video games, publishing, headphones and health drinks, and supplements. With annual sales quickly approaching $300 million from a variety of business interests along with numerous business endeavors on the horizon, 50 Cent has cemented his position in the industry as both a business and entertainment powerhouse.

Angelina Jolie-Voight is an American actress, activist, and filmmaker and she is the Founder of Maddox Jolie-Pitt. She was a Speaker at Council on Foreign Relations.

Patrick Tilley

Mario Götze is a professional footballer.

Katie is the Founder and General Partner of Moxxie Ventures. Prior to Moxxie, Katie served in numerous executive operating roles at Twitter, Google, Yahoo, and Color. She has led teams in marketing, comms, recruiting, product and media. In addition to working in Silicon Valley, Katie served in the (Obama) White House and State Department andbegan her career as a banker at JP Morgan Chase. Katie sits on the Board of Vivendi, a French multinational media company headquartered in Paris, and previously served on the Board of Time Inc. Katie started her venture career as a Founding Partner of #Angels and has invested in 40 early-stage companies including Airtable, Cameo, Carta, Coinbase, Literati, Modern Fertility, Shape Security and Threads.

Ashton Kutcher is an actor, investor, entrepreneur, producer and philanthropist.Kutcher has been named one of TIME magazine’s “100 Most Influential People in the World,” as well as being honored by Vanity Fair ‘s “New Establishment List,” which identifies the top 50 of an innovative new breed of buccaneering visionaries, engineering prodigiesand entrepreneurs. Twice, Kutcher was named one of Forbes magazine’s “World’s Most Powerful Celebrities,” as well as one of Fast Company magazine’s “Most Creative People.”Kutcher has been investing in technology for over a decade, both as an angel investor and a founding partner of A-Grade Investments and Sound Ventures. His fund portfolio includes Airbnb, Uber, Flexport, Brex, Robinhood, Bird, Airtable and Affirm among others.Kutcher is also the co-founder of Thorn: Digital Defenders of Children (www.thorn.org). Thorn drives technology innovation to fight the sexual exploitation of children.Kutcher currently stars in the Netflix original series, The Ranch. He also serves as Executive Producer. Until 2015, Kutcher starred in the CBS comedy series Two and a Half Men. The show ranked as the second most-watched comedy on all of network television. Kutcher first gained recognition as Michael Kelso on the Fox series That 70’s Show, and went on to star in a variety of box office hits on the big screen – including What Happens In Vegas with Cameron Diaz, The Guardian with Kevin Costner, No Strings Attached with Natalie Portman and the cult hit Dude, Where’s My Car.Kutcher served as co-creator and producer of MTV's hit series, “Punk'd,” and The CW's reality series “Beauty and the Geek” and “True Beauty.” He has also produced films such as No Strings Attached, Killers and The Butterfly Effect. Additionally, Kutcher co-founded APlus, a digital media company devoted to spreading the message of positive journalism, a kind of storytelling that focuses on our shared humanity. In 2016, APlus was purchased by Chicken Soup for the Soul.

Entrepreneur & Angel Investor

David Mytton is currently building Arcjet, a product to help developers protect their apps. He also writes the console.dev weekly devtools newsletter which reviews the most interesting tools for developers.In the past, he co-founded Server Density, a cloud infrastructure monitoring startup which was acquired in 2018 by edge computing platform,StackPath.

Tobi Lütke founded Shopify in 2004. He has served as the Chief Executive Officer since 2008. Tobi worked on the core team of the Ruby on Rails framework and has created many popular open source libraries such as Active Merchant.