David Buller

Managing Partner at KELES | Digital Health Investor | Partner at Ascension Life Fund | VP at Ascension | Exited Healthtech Founder

📍 London, England Metropolitan Area, United Kingdom🔄 Updated September 2026💼 2 investments📅 10 years investing🗓 Last invested Jan 2019𝕏 @upgrade_to_unlock
VC🌍 United Kingdom
2
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Experience · 8 entries
All (8)
Investments (2)
Founder (2)
2023
Managing Partner
2023
VC firm investing in European growth stage digital health companies. Led by the former Chief Strategy Officer of Sanofi & a digital health VC partner, KELES bridges the gap between start up innovation, international scaling and global impact. We are uniquely positioned to access the best deals, enable scale up and maximize exit opportunities. Weve sat at every seat around the table; from inception to exit to investor and acquirer, we know the economics and how-to of execution. €250m Fund - Ticket Size €8m to €30m KELES Investment Focus: Growth Stage - Demonstrated Profitability - Scaling Inflection Point 3 Core Digital Health Segments: New R&D Model (techbio/digitised trials) - Diagnostics (AI imaging/digital medtech) - Patient Care (acute/chronic) The fund KELES S.C.Sp., SICAV - RAIF is established in Luxembourg, and we have bases in Paris, London and Brussels.
2020
Member
2020
Venture capitalists are committed to funding America’s most innovative entrepreneurs, working closely with them to transform breakthrough ideas into emerging growth companies that drive U.S. job creation and economic growth. As the voice of the U.S. venture capital community, the National Venture Capital Association empowers its members and the entrepreneurs they fund by advocating for policies that encourage innovation and reward long-term investment. The NVCA also serves as the definitive resource for venture capital data and unites its members through a full range of professional services.
2019
Mentor
Dec 2019
500 Global is a venture capital firm with over $2.7B in Assets Under Management that invests early in founders building fast-growing technology companies. We focus on markets where technology, innovation, and capital can unlock long-term value and drive economic growth. 500 Global has backed over 5,000 founders representing more than 2,600 companies operating in 80 countries. Our portfolio includes 51 companies valued at over $1 billion and 140 companies valued at over $100 million. Our 140+ plus team members are located in more than 15 countries and bring experience as entrepreneurs, investors, and operators from some of the world’s leading technology companies.
Member and Investor
2019
The Band of Angels is Silicon Valleys oldest seed funding organization. We are a formal group of more than 150 former and current high tech executives who are interested in investing their time and money into new, cutting edge, startup companies. Weve seeded over 277 companies in our history with 61 profitable M&A exits and 11 IPOs. Band members have founded companies such as Symantec, Logitech, and National Semiconductor and been senior executives at the likes of Sun Microsystems, Hewlett Packard, and Intuit. The Band meets monthly to formally consider three startups selected from among the more than 50 that are screened each month by the Band Deal Selection Process. Entrepreneurs can expect a thorough examination and, occasionally, an investment from some of Silicon Valleys most accomplished entrepreneurs.
2018
Venture Partner
Dec 2018
Ascension is an early-stage venture capital firm built and managed by exited operators and entrepreneurs to back the next generation of tech and impact founders. Since 2015, Ascension has invested in 150+ start-ups across its (S)EIS & Institutional Funds – our specialist approach and extensive sector reach allow us to identify and scale pioneering tech enterprises. With over £83m under management and twelve exits, Ascension is the most active VC in London over the past decade (Beauhurst) and is UKBAAs Seed VC of the Year in 2022. Ascension is particularly focused on backing impact businesses leveraging the power of technology to solve some of the world’s biggest problems.
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