Justin Butler

Building

📍 San Francisco Bay Area, United States🔄 Updated September 2026💼 16 investments📅 11 years investing🗓 Last invested May 2026𝕏 @upgrade_to_unlock
Operator-angel🌍 United StatesInvested this year
16
Total investments
7
Early stage
2
Mid stage
3
Late stage
11y
Years active

Portfolio

15 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Member
Apr 2023
At Capstan Medical, we’re driven by an unwavering commitment to transforming the treatment of structural heart disease. By merging surgical robotics with catheter-based technology and next generation implants, we’ve pioneered a patient-optimized approach to repair and replace heart valves.
Board Member, Founder
Sep 2022
Transforming lives with radiopharmaceuticals by leveraging world class clinical, development, manufacturing, and supply chain expertise. Nucleus bridges the gap between innovation and clinic.
Board Observer
May 2022
Watchmaker Genomics combines deep domain expertise in protein engineering with enzyme manufacturing to address the demanding quality, performance and scale requirements of high-growth genomics applications. We see our clients as partners and view technical and supply chain challenges as opportunities for mutual success. Watchmaker’s best-in-class scientific competencies enable a disruptive approach to life science partnerships.
Board Member
Sep 2021
The last decade has seen amazing progress in neuroscience, enabling researchers to envision a new generation of brain machine interfaces. These systems will be used to treat chronic diseases like Parkinsons, epilepsy, and Alzheimers. They will restore mobility to the paralyzed and speed recovery from a stroke. They may even allow us to control our mood and enhance our cognition. Rune Labs wants to build the software at the heart of these systems, and help accelerate the next wave of neuromodulation applications.
Board Member
Apr 2021
Originating in 2015 as the doctoral research of CEO George Netscher—and inspired by his own familys experience with Alzheimers disease—SafelyYou was spun out of UC Berkeley’s Artificial Intelligence Research Lab, one of the top five AI research groups in the world. The company’s passionate mission is to empower safer, more person-centered dementia care through world-leading, real-time AI video technology and 24/7 remote clinical experts. SafelyYou is used by skilled nursing facilities and assisted living communities all across North America—from the largest national organizations to regional and local ones, too. SafelyYou is one of five most innovative fall technologies referenced in the Senate Falls Report (2019). SafelyYou gives a voice to those living with Alzheimer’s and other forms of dementia. Its AI-video technology sees critical care moments in real-time, detecting on-the-ground events with over 99.5% accuracy. SafelyYou’s remote clinical experts have seen more falls and on-the-ground events than anyone in the world, enabling a level of predictive, person-centered dementia care that was never before possible. SafelyYou is solving a critical problem across senior care and making an impact by reducing falls by 40% and fall-related ER visits by 80%.
Board Member
Aug 2019
For life sciences companies pursuing digital transformation, we offer the leading technology to rapidly develop, launch, and scale digital solutions. Our cloud-based platform is the trusted foundation for companion apps, algorithms, connected combination products, healthcare provider interfaces and other Software as a Medical Device (SaMD).   Our customers partner with BrightInsight to differentiate their therapies and harness unique real-world data to drive measurable value. With a track record of successful product launches that yield business and clinical ROI for top life sciences companies’ flagship brands in their largest markets, BrightInsight is the proven leader in this space.
Board Member
Jul 2019
Cellares is the first Integrated Development and Manufacturing Organization (IDMO) and takes an Industry 4.0 approach to mass manufacturing the living drugs of the 21st century. The company is both developing and operating integrated technologies for cell therapy manufacturing to accelerate access to life-saving cell therapies. The company’s Cell Shuttle integrates all the technologies required for the entire manufacturing process in a flexible and high-throughput platform that delivers true walk-away, end-to-end automation. Cell Shuttles will be deployed in Cellares’ Smart Factories around the world to meet total patient demand for cell therapies at global scale. Partnering with Cellares enables academics, biotechs, and pharma companies to accelerate drug development and scale out manufacturing, lower process failure rates, lower manufacturing costs, and meet global patient demand. The company is headquartered in South San Francisco, California with its commercial-scale IDMO Smart Factory in Bridgewater, New Jersey. The company is backed by world-class investors and has raised over $355 million in financing.
Board Member
Mar 2019
Founded in 2018, Syng is a design and engineering led audio experience company that gives listeners and creators the power to engage with deeply immersive sound. With user experience at its core, Syng creates hardware and software products that are intuitive, beautiful, and designed for any space. Cell Alpha is the companys flagship speaker that uses Syngs patented Triphonic technology to bring rich and magical spatial sound to life. Syng is based in Venice Beach, California. Learn more at syngspace.com.
Board Member
Dec 2018
Acquired by Reddit, Inc. in June 2022. We're Making Deep Learning and Artificial Intelligence Accessible to Everyone. We want to empower and transform the global workforce by making deep learning and artificial intelligence accessible to everyone. We believe that as organizations and individuals can harness the power of machine learning, our world will change quickly. Our mission is to make sure the technology driving this change is not mysterious and locked away but open and available for everyone.
Board Member
Nov 2018
Veev is a building technology company that develops homes. Since day one, we have been driven by the conviction that exceptional living should be an attainable reality,
 not an impossible dream or an endless project. To bring this vision to life, we have reimagined the way the home experience 
is designed, built, and serviced. Veev’s advanced technologies optimize every stage and square inch, powering our ability 
to create cutting-edge home experiences with unparalleled efficiency. Before Veev, accessible high-end living was a contradiction. The Veev home experience defies industry
 paradigms and raises user expectations, delivering an exceptional new standard in living.
Board Member
Nov 2018
Veev is a building technology company that develops homes. Since day one, we have been driven by the conviction that exceptional living should be an attainable reality,
 not an impossible dream or an endless project. To bring this vision to life, we have reimagined the way the home experience 
is designed, built, and serviced. Veev’s advanced technologies optimize every stage and square inch, powering our ability 
to create cutting-edge home experiences with unparalleled efficiency. Before Veev, accessible high-end living was a contradiction. The Veev home experience defies industry
 paradigms and raises user expectations, delivering an exceptional new standard in living.
Board Member
Jun 2017
Cycuity is a cybersecurity company that provides security assurance for semiconductor chips, a rapidly emerging target for remote cyberattacks. Cycuity’s security solutions enable comprehensive, scalable, and traceable security verification to ensure the chips powering our modern electronic systems are developed securely. Similar to the DevSecOps approach for software, our Radix technology integrates automated security assurance at every step of the hardware development lifecycle so organizations can detect and mitigate vulnerabilities before manufacturing.
Board Observer
2017
Tenstorrent is a next-generation computing company that builds computers for AI. Headquartered in the U.S. with offices in Austin, Texas, and Silicon Valley, and global offices in Toronto, Belgrade, Seoul, Tokyo, and Bangalore, Tenstorrent brings together experts in the field of computer architecture, ASIC design, RISC-V technology, advanced systems, and neural network compilers. Tenstorrent is backed by Eclipse Ventures and Real Ventures, Archerman Capital, Samsung Catalyst Fund, and Hyundai Motor Group among others. Join us: www.tenstorrent.com/careers.
Board Member
2016
Common Networks is a wireless 5G home internet provider that brings fiber-class speeds to communities across the country. Founded in 2016, the company is based in San Francisco and has raised more than $34 million in funding from notable partners including General Catalyst, Eclipse Ventures, and Lux Capital.
Board Member
2015
Lucira Health has developed an at home COVID-19 test kit that delivers PCR quality molecular accuracy in the palm of your hand in 30 minutes or less. Our technology is transforming how we reduce the spread of infectious diseases by bringing accurate, easy-to-use self-testing into the home. This home test kit has not been FDA cleared or approved. This home test kit has been authorized by FDA under EUA. This home test kit has been authorized only for the testing of nasal swabs for detection of nucleic acid from SARS-CoV-2, not for any other viruses or pathogens. This home test kit is only authorized for the duration of the declaration that circumstances exist justifying the authorization of emergency use of IVDs for detection and/or diagnosis of COVID-19 under Section 564(b)(1) of the Act, 21 U.S.C. § 360bbb-3(b)(1), unless the declaration is terminated or revoked sooner.
early stageMedical Device
Experience · 18 entries
All (18)
Investments (15)
Founder (2)
Board (15)
2026
Board Member
May 2026
The American Cancer Society is a leading cancer-fighting organization with a vision to end cancer as we know it, for everyone. We are the only organization improving the lives of people with cancer and their families through advocacy, research, and patient support, to ensure that everyone has an opportunity to prevent, detect, treat, and survive cancer. Learn more at cancer.org or by calling us at 1-800-227-2345.
2023
Board Member
Apr 2023
At Capstan Medical, we’re driven by an unwavering commitment to transforming the treatment of structural heart disease. By merging surgical robotics with catheter-based technology and next generation implants, we’ve pioneered a patient-optimized approach to repair and replace heart valves.
2022
Board Member, Founder
Sep 2022
Transforming lives with radiopharmaceuticals by leveraging world class clinical, development, manufacturing, and supply chain expertise. Nucleus bridges the gap between innovation and clinic.
Board Observer
May 2022
Watchmaker Genomics combines deep domain expertise in protein engineering with enzyme manufacturing to address the demanding quality, performance and scale requirements of high-growth genomics applications. We see our clients as partners and view technical and supply chain challenges as opportunities for mutual success. Watchmaker’s best-in-class scientific competencies enable a disruptive approach to life science partnerships.
2021
Board Member
Sep 2021
The last decade has seen amazing progress in neuroscience, enabling researchers to envision a new generation of brain machine interfaces. These systems will be used to treat chronic diseases like Parkinsons, epilepsy, and Alzheimers. They will restore mobility to the paralyzed and speed recovery from a stroke. They may even allow us to control our mood and enhance our cognition. Rune Labs wants to build the software at the heart of these systems, and help accelerate the next wave of neuromodulation applications.
Show all 18 entries ↓
Investment activity
2015–2026 · 16 investments
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